Financial Commitments (Tables)

12 Months Ended

Dec. 31, 2018

Financial Commitments [Abstract]

Long-Term Debt

	As of December 31,
(in thousands)	2018		2017
2017 Senior Notes	$	493,521	$	492,734
Convertible Notes		171,481		161,635
2017 Credit Facility		41,000		—
Equipment financing and mortgages		50,904		76,820
Other indebtedness		4,598		5,087
Total debt		761,504		736,276
Less: Current maturities		16,767		30,748
Long-term debt, net	$	744,737	$	705,528

Reconciliation Of Outstanding Debt Balance To Reported Debt Balance

	As of December 31, 2018						As of December 31, 2017
(in thousands)	Outstanding Long-Term Debt		Unamortized Discount and Issuance Costs		Long-Term Debt, as reported		Outstanding Long-Term Debt		Unamortized Discounts and Issuance Costs		Long-Term Debt, as reported
2017 Senior Notes	$	500,000	$	(6,479)	$	493,521	$	500,000	$	(7,266)	$	492,734
Convertible Notes		200,000		(28,519)		171,481		200,000		(38,365)		161,635

Summary Of Information Related To The Liability And Equity Components Of The Convertible Notes

(in thousands)	December 31, 2018		December 31, 2017
Liability component:
Principal	$	200,000	$	200,000
Conversion feature		(46,800)		(46,800)
Allocated debt issuance costs		(5,051)		(5,051)
Amortization of discount and debt issuance costs (non-cash interest expense)		23,332		13,486
Net carrying amount	$	171,481	$	161,635
Equity component:
Conversion feature	$	46,800	$	46,800
Allocated debt issuance costs		(1,543)		(1,543)
Deferred taxes		(18,815)		(18,815)
Net carrying amount	$	26,442	$	26,442

Principal Payments of Long-Term Debt

Year (in thousands)
2019	$	16,817
2020		46,275
2021		218,875
2022		7,457
2023		7,078
Thereafter		500,000
		796,502
Less: Unamortized discount and issuance costs		(34,998)
Total	$	761,504

Summary Of Interest Expense As Reported In The Consolidated Statements of Operations

	For the year ended December 31,
(in thousands)	2018		2017		2016
Cash interest expense:
Interest on 2017 Senior Notes	$	34,375	$	23,967	$	—
Interest on 2017 Credit Facility		8,575		5,517		—
Interest on Convertible Notes		5,750		5,750		3,115
Interest on 2010 Senior Notes		—		6,926		22,875
Interest on 2014 Credit Facility		—		4,455		19,201
Other interest		2,747		3,261		3,623
Cash portion of loss on extinguishment		—		1,913		—
Total cash interest expense		51,447		51,789		48,814
Non-cash interest expense(a):
Amortization of discount and debt issuance costs on Convertible Notes		9,846		8,967		4,519
Amortization of debt issuance costs on 2017 Credit Facility		1,439		962		—
Amortization of debt issuance costs on 2017 Senior Notes		787		516		—
Amortization of debt issuance costs on 2014 Credit Facility		—		1,703		5,447
Amortization of discount and debt issuance costs on 2010 Senior Notes		—		308		1,002
Non-cash portion of loss on extinguishment		—		5,139		—
Total non-cash interest expense		12,072		17,595		10,968
Total interest expense	$	63,519	$	69,384	$	59,782

(a)   The combination of cash and non-cash interest expense produces effective interest rates that are higher than contractual rates. Accordingly, the effective interest rates for the 2017 Senior Notes and the Convertible Notes were7.13% and 9.39%,  respectively, for the year ended December 31, 2018.

Future Minimum Rent Payments under Non-Cancelable Operating Leases

Year (in thousands)
2019	$	14,039
2020		10,706
2021		7,464
2022		6,567
2023		5,587
Thereafter		11,662
		56,025
Less: Sublease rental agreements		(1,398)
Total	$	54,627