Debt (Tables)

6 Months Ended

Jun. 30, 2015

Debt Disclosure [Abstract]

Schedule of Long-term Debt Instruments

Long-term debt consisted of the following as of June 30, 2015 and December 31, 2014:

	June 30, 2015		December 31, 2014
	(In thousands)
Long-term debt
Deferred purchase payment due 2015		$—		$150,000
Unamortized discount for deferred purchase payment	—		(1,100		)
Senior Secured Revolving Credit Facility due 2018	117,000		—
8.625% Senior Notes due 2018	—		600,000
Unamortized discount for 8.625% Senior Notes	—		(3,444		)
7.50% Senior Notes due 2020	600,000		600,000
Unamortized premium for 7.50% Senior Notes	1,360		1,465
6.25% Senior Notes due 2023	650,000		—
Other long-term debt due 2028	4,425		4,425
Total long-term debt		$1,372,785		$1,351,346

Interest and Commitment Fee Rates

The Company also incurs commitment fees as set forth in the table below on the unused portion of lender commitments, and which are included as a component of interest expense.

Ratio of Outstanding Borrowings and Letters of Credit to Lender Commitments	Applicable Margin for Base Rate Loans	Applicable Margin for Eurodollar Loans	Commitment Fee
Less than 25%	0.50%	1.50%	0.375%
Greater than or equal to 25% but less than 50%	0.75%	1.75%	0.375%
Greater than or equal to 50% but less than 75%	1.00%	2.00%	0.500%
Greater than or equal to 75% but less than 90%	1.25%	2.25%	0.500%
Greater than or equal to 90%	1.50%	2.50%	0.500%