v3.3.1.900
Long-Term Debt - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]      
Interest expense $ 29,063 $ 29,959 $ 39,805
Senior Notes      
Debt Instrument [Line Items]      
Interest expense 28,687 28,687 18,084
Accrued interest 1,523 1,523  
Debt issuance costs amortization expense $ 376 $ 375 $ 223