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 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Schedule of Condensed Statement of Comprehensive Income [Line Items]        
Net income $ 8,118 $ 10,831 $ 17,064 $ 57,265
Currency translation difference on related borrowings (577) 0 (1,542) 0
Currency translation difference on foreign currency net investments 2,098 0 2,499 0
Total other comprehensive gain, net of tax: 1,521 0 957 0
Comprehensive income 9,639 10,831 18,021 57,265
Comprehensive (income) attributable to noncontrolling interest (53) 0 (83) 0
Comprehensive income attributable to controlling interest 9,586 10,831 17,938 57,265
Parent [Member]
       
Schedule of Condensed Statement of Comprehensive Income [Line Items]        
Net income 7,970 10,936 16,843 57,411
Currency translation difference on related borrowings 0   0  
Total other comprehensive gain, net of tax: 0   0  
Comprehensive income 7,970   16,843  
Comprehensive (income) attributable to noncontrolling interest 0   0  
Comprehensive income attributable to controlling interest 7,970   16,843  
Guarantor [Member]
       
Schedule of Condensed Statement of Comprehensive Income [Line Items]        
Net income 10,817 16,694 27,612 63,505
Currency translation difference on related borrowings 0   0  
Total other comprehensive gain, net of tax: 0   0  
Comprehensive income 10,817   27,612  
Comprehensive (income) attributable to noncontrolling interest 0   0  
Comprehensive income attributable to controlling interest 10,817   27,612  
Non-Guarantor [Member]
       
Schedule of Condensed Statement of Comprehensive Income [Line Items]        
Net income 11,653 (6,203) 8,939 42,011
Currency translation difference on related borrowings (577)   (1,542)  
Currency translation difference on foreign currency net investments 2,098   2,499  
Total other comprehensive gain, net of tax: 1,521   957  
Comprehensive income 13,174   9,896  
Comprehensive (income) attributable to noncontrolling interest (53)   (83)  
Comprehensive income attributable to controlling interest 13,121   9,813  
Eliminations [Member]
       
Schedule of Condensed Statement of Comprehensive Income [Line Items]        
Net income (22,322) (10,596) (36,330) (105,662)
Currency translation difference on related borrowings 0   0  
Total other comprehensive gain, net of tax: 0   0  
Comprehensive income (22,322)   (36,330)  
Comprehensive (income) attributable to noncontrolling interest 0   0  
Comprehensive income attributable to controlling interest $ (22,322)   $ (36,330)