Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2017

Long-Term Debt

Schedule Of Long-Term Debt

	December 31, 2017		December 31, 2016
	(In thousands)
Revolving credit facility, including swingline credit facility (weighted average combined interest rate of 3.2% and 4.0% as of December 31, 2017 and December 31, 2016, respectively)	$	122,461	$	14,100
1.00% Convertible Senior Notes due 2020, net of unamortized discount and capitalized debt issuance costs		251,973		241,068
5.125% Senior Notes due 2022, net of capitalized debt issuance costs		248,038		247,371
5.50% Senior Notes due 2025, net of capitalized debt issuance costs		295,249		—
Total long-term debt	$	917,721	$	502,539

Schedule of Interest Expense Related to Convertible Notes

	Year Ended
	December 31,
	2017		2016		2015
	(In thousands)
Cash interest per contractual coupon rate	$	2,875	$	2,875	$	2,875
Amortization of note discount		10,210		9,690		9,194
Amortization of debt issuance costs		695		624		559
Total interest expense related to Convertible Notes	$	13,780	$	13,189	$	12,628

Schedule of Convertible Debt

	December 31, 2017		December 31, 2016
	(In thousands)
Principal balance	$	287,500	$	287,500
Unamortized discount and capitalized debt issuance costs		(35,527)		(46,432)
Net carrying amount of Convertible Notes	$	251,973	$	241,068

Schedule Of Maturities Of Long-Term Debt

2018	$	—
2019		—
2020		287,500
2021		122,461
2022		250,000
Thereafter		300,000
Total	$	959,961