Annual report pursuant to Section 13 and 15(d)

Long-Term Debt - Term Loan (Details)

v3.6.0.2
Long-Term Debt - Term Loan (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Jan. 22, 2014
Debt Instrument [Line Items]        
Long-term Debt $ 585,000 $ 585,000    
Repayments of long-term debt $ 0 30,000 $ 435,000  
9.125% Senior Notes, due April 2018 (Issued April 25, 2012) [Member]        
Debt Instrument [Line Items]        
Long-term Debt   $ 225,000    
Secured Debt [Member]        
Debt Instrument [Line Items]        
Revolving loan outstanding       $ 40,000