Quarterly report pursuant to Section 13 or 15(d)

Parent, Guarantor, Non-Guarantor Unaudited Consolidating Condensed Financial Statements Parent, Guarantor, Non-Guarantor Unaudited Consolidating Condensed Financial Statements - Statement of Comprehensive Income (Loss) (Details)

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Parent, Guarantor, Non-Guarantor Unaudited Consolidating Condensed Financial Statements Parent, Guarantor, Non-Guarantor Unaudited Consolidating Condensed Financial Statements - Statement of Comprehensive Income (Loss) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Schedule of Condensed Statement of Comprehensive Income [Line Items]        
Net income $ 15,837 $ 8,374 $ 3,445 $ 8,946
Currency translation difference on related borrowings 336 (965) (468) (965)
Currency translation difference on foreign currency net investments (188) 401 511 401
Total other comprehensive income (loss), net of tax: 148 (564) 43 (564)
Comprehensive income (loss) 15,985 7,810 3,488 8,382
Comprehensive (income) attributable to noncontrolling interest (80) (30) (234) (30)
Comprehensive income (loss) attributable to controlling interest 15,905 7,780 3,254 8,352
Parent [Member]
        
Schedule of Condensed Statement of Comprehensive Income [Line Items]        
Net income 15,681 8,281 3,132 8,873
Currency translation difference on related borrowings 0 0 0 0
Currency translation difference on foreign currency net investments     0 0
Total other comprehensive income (loss), net of tax: 0 0 0 0
Comprehensive income (loss) 15,681 8,281 3,132 8,873
Comprehensive (income) attributable to noncontrolling interest 0 0 0 0
Comprehensive income (loss) attributable to controlling interest 15,681 8,281 3,132 8,873
Guarantor [Member]
        
Schedule of Condensed Statement of Comprehensive Income [Line Items]        
Net income 22,148 6,809 34,191 16,794
Currency translation difference on related borrowings 0 0 0 0
Currency translation difference on foreign currency net investments     0 0
Total other comprehensive income (loss), net of tax: 0 0 0 0
Comprehensive income (loss) 22,148 6,809 34,191 16,794
Comprehensive (income) attributable to noncontrolling interest 0 0 0 0
Comprehensive income (loss) attributable to controlling interest 22,148 6,809 34,191 16,794
Non-Guarantor [Member]
        
Schedule of Condensed Statement of Comprehensive Income [Line Items]        
Net income (1,333) 7,112 (2,729) (2,714)
Currency translation difference on related borrowings 336 (965) (468) (965)
Currency translation difference on foreign currency net investments (188) 401 511 401
Total other comprehensive income (loss), net of tax: 148 (564) 43 (564)
Comprehensive income (loss) (1,185) 6,548 (2,686) (3,278)
Comprehensive (income) attributable to noncontrolling interest (80) (30) (234) (30)
Comprehensive income (loss) attributable to controlling interest (1,265) 6,518 (2,920) (3,308)
Eliminations [Member]
        
Schedule of Condensed Statement of Comprehensive Income [Line Items]        
Net income (20,659) (13,828) (31,149) (14,007)
Currency translation difference on related borrowings 0 0 0 0
Currency translation difference on foreign currency net investments     0 0
Total other comprehensive income (loss), net of tax: 0 0 0 0
Comprehensive income (loss) (20,659) (13,828) (31,149) (14,007)
Comprehensive (income) attributable to noncontrolling interest 0 0 0 0
Comprehensive income (loss) attributable to controlling interest $ (20,659) $ (13,828) $ (31,149) $ (14,007)