Debt (Tables)

12 Months Ended

Dec. 31, 2016

Debt Instruments [Abstract]

Schedule of Long-term Debt Instruments

Long-term Debt

The carrying amounts of our long-term debt are as follows:

	December 31, 2016			December 31, 2015
	(In thousands)
Credit Agreement
Amount outstanding	$	553,000		$	712,000
6% Senior Notes
Principal	400,000			—
Unamortized debt issuance costs	(6,607		)	—
	393,393			—
6.5% Senior Notes
Principal	300,000			300,000
Unamortized discount and debt issuance costs	(2,481		)	(3,248		)
	297,519			296,752
Total long-term debt	$	1,243,912		$	1,008,752

Schedule of Maturities of Long-term Debt

Maturities of our long-term debt are as follows:

Years Ending December 31,	(In thousands)
2017	$	—
2018	553,000
2019	—
2020	300,000
2021	—
Thereafter	400,000
Total	$	1,253,000

Schedule of Derivative Instruments

Additional information on our interest rate swaps is as follows:

Derivative Instrument	Balance Sheet Location	Fair Value			Location of Offsetting Balance	Offsetting Amount
	(In thousands)
December 31, 2016
Interest rate swaps designated as cash flow hedging instrument:
Variable-to-fixed interest rate swap contract ($150 million of LIBOR based debt interest)	Other current     assets	$	91		Accumulated other     comprehensive loss	$	91
		$	91			$	91
December 31, 2015
Interest rate swaps designated as cash flow hedging instrument:
Variable-to-fixed interest rate swap contract ($150 million of LIBOR based debt interest)	Other long-term     assets	$	304		Accumulated other     comprehensive loss	$	304
Variable-to-fixed interest rate swap contract ($155 million of LIBOR based debt interest)	Other current liabilities	(114		)	Accumulated other     comprehensive income	(114		)
		$	190			$	190

Schedule of Interest Expense and Other Debt Information

Interest expense consists of the following components:

	Years Ended December 31,
	2016		2015		2014
	(In thousands)
Interest on outstanding debt:
Credit Agreement, net of interest on interest rate swaps	$	17,621	$	16,107	$	13,350
6% Senior Notes	10,811		—		—
6.5% Senior Notes	19,507		19,507		19,446
8.25% Senior Notes	—		—		2,544
Amortization of discount and deferred debt issuance costs	3,246		1,928		1,821
Commitment fees and other	2,069		638		450
Total interest incurred	53,254		38,180		37,611
Less capitalized interest	702		762		1,510
Net interest expense	$	52,552	$	37,418	$	36,101
Cash paid for interest	$	38,530	$	35,938	$	39,414

Schedule of Capital Lease Obligations [Table Text Block]

At December 31, 2016, future minimum annual lease payments, including interest, for the capital leases are as follows:

Years Ending December 31,	(in thousands)
2017	$	1,340
2018	679
2019	431
2020	10
Total minimum lease payments	2,460
Less amount representing interest	(165		)
Capital lease obligations	$	2,295