Long-Term Debt (Tables)

3 Months Ended

Mar. 31, 2018

Debt Disclosure [Abstract]

Schedule of Credit Agreement Facilities [Table Text Block]

The following table presents the outstanding balance, total amount of letters of credit outstanding, and available borrowing capacity under the Credit Agreement as of April 25, 2018, March 31, 2018, and December 31, 2017:

	As of April 25, 2018		As of March 31, 2018		As of December 31, 2017
	(in thousands)
Credit facility balance (1)	$	—	$	—	$	—
Letters of credit (2)	200		200		200
Available borrowing capacity	999,800		924,800		924,800
Total aggregate lender commitment amount	$	1,000,000	$	925,000	$	925,000

____________________________________________

⁽¹⁾  Unamortized deferred financing costs attributable to the credit facility are presented as a component of other noncurrent assets on the accompanying balance sheets and totaled $2.7 million and $3.1 million as of March 31, 2018, and December 31, 2017, respectively.

⁽²⁾  Letters of credit outstanding reduce the amount available under the credit facility on a dollar-for-dollar basis.

Schedule of Senior Notes [Table Text Block]

The Senior Notes, net of unamortized deferred financing costs line on the accompanying balance sheets as of March 31, 2018, and December 31, 2017, consisted of the following:

	As of March 31, 2018						As of December 31, 2017
	Principal Amount		Unamortized Deferred Financing Costs		Senior Notes, Net of Unamortized Deferred Financing Costs		Principal Amount		Unamortized Deferred Financing Costs		Senior Notes, Net of Unamortized Deferred Financing Costs
	(in thousands)
6.50% Senior Notes due 2021	$	344,611	$	2,483	$	342,128	$	344,611	$	2,656	$	341,955
6.125% Senior Notes due 2022	561,796		5,505		556,291		561,796		5,800		555,996
6.50% Senior Notes due 2023	394,985		3,525		391,460		394,985		3,707		391,278
5.0% Senior Notes due 2024	500,000		5,380		494,620		500,000		5,610		494,390
5.625% Senior Notes due 2025	500,000		6,487		493,513		500,000		6,714		493,286
6.75% Senior Notes due 2026	500,000		7,033		492,967		500,000		7,242		492,758
Total	$	2,801,392	$	30,413	$	2,770,979	$	2,801,392	$	31,729	$	2,769,663

Schedule of Senior Convertible Notes [Table Text Block]

The net carrying amount of the liability component of the Senior Convertible Notes, as reflected on the accompanying balance sheets as of March 31, 2018, and December 31, 2017, consisted of the following:

	As of March 31, 2018			As of December 31, 2017
	(in thousands)
Principal amount of Senior Convertible Notes	$	172,500		$	172,500
Unamortized debt discount	(28,251		)	(30,183		)
Unamortized deferred financing costs	(2,980		)	(3,210		)
Net carrying amount	$	141,269		$	139,107