Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2017

Debt Disclosure [Abstract]

Outstanding Long-Term Debt

As of the dates indicated below, the Company had the following outstanding long-term debt (in thousands):

	December 31,
	2017		2016
5.875% senior notes due 2020, net of deferred financing costs of $2,061 and $3,025	$	364,881	$	371,975
5.000% senior notes due 2021, net of deferred financing costs of $3,142 and $4,111	446,858		445,889
1.500% convertible senior notes due 2019, net of original issue discount of $6,634 and $31,093 and deferred financing costs of $1,486 and $3,061	91,527		265,846
First-lien credit facility due 2023, including deferred gain of $18,911, and net of original discount of $1,228, and deferred financing costs of $3,445	177,560		—
	$	1,080,826	$	1,083,710

The table below summarizes the Company's cash interest payments (in thousands):

	Cash Interest Payments		Payment Dates
5.875% senior notes due 2020	$	10,779	April 1 and October 1
5.000% senior notes due 2021	11,250		March 1 and September 1
1.500% convertible senior notes due 2019	747		March 1 and September 1
First-lien credit facility due 2023 (1)	1,025		Variable

(1) The interest rate on the first-lien credit facility is variable based on the Company's election. The amount reflected in this table is the monthly amount payable based on the 30-day LIBOR interest rate that was elected and in effect on December 31, 2017. Please see further discussion of the variable interest rate below.

Annual Maturities of Debt

Annual maturities of debt, excluding the potential effects of conditions discussed in Convertible Senior Notes, during each year ending December 31, are as follows (in thousands):

2018	$	—
2019	99,647
2020	366,942
2021	450,000
2022	—
Thereafter	163,322
	$	1,079,911

Schedule of Face Value, Carrying Value and Fair Value [Line Items]

Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block]

As of the dates indicated below, the Company had the following face values, carrying values and fair values (in thousands):

	December 31, 2017						December 31, 2016
	Face Value		Carrying Value		Fair Value		Face Value		Carrying Value		Fair Value
5.875% senior notes due 2020	$	366,942	$	364,881	$	244,714	$	375,000	$	371,975	$	270,938
5.000% senior notes due 2021	450,000		446,858		236,250		450,000		445,889		301,343
1.500% convertible senior notes due 2019	99,647		91,527		74,486		300,000		265,846		216,195
First-lien credit facility due 2023 (1)	163,322		177,560		162,505		—		—		—
	$	1,079,911	$	1,080,826	$	717,955	$	1,125,000	$	1,083,710	$	788,476

(1) The carrying value of the first-lien credit facility due 2023 includes a deferred gain of $18,911 less original issue discount and deferred financing costs of $4,673.