Annual report pursuant to Section 13 and 15(d)

Long-Term Debt - Long-Term Debt (Details)

v3.3.1.900
Long-Term Debt - Long-Term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Revolving bank credit facility   $ 447,000
Total long-term debt $ 1,196,855 1,352,120
Long-term debt, less current maturities 1,196,855 1,352,120
8.50% Senior Notes    
Debt Instrument [Line Items]    
Principal 900,000 900,000
Debt premiums, net of amortization 10,503 13,057
Debt issuance costs, net of amortization (6,274) $ (7,937)
9.00% Term Loan due 2020    
Debt Instrument [Line Items]    
Principal 300,000  
Debt issuance costs, net of amortization (4,685)  
Debt discounts, net of amortization $ (2,689)