Consolidated Statements of Stockholders' Equity (Deficit) Statement - USD ($) $ in Thousands	Total		Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings (Accumulated Deficit) [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Series 2012 Notes [Member] Additional Paid-in Capital [Member]	February 2018 Notes [Member]	February 2018 Notes [Member] Additional Paid-in Capital [Member]
Noncontrolling Interest in Variable Interest Entity	$ 0
Beginning Balance (in shares) at Dec. 31, 2013			139,934,569
Beginning Balance at Dec. 31, 2013	113,489		$ 1,399	$ (233,173)	$ 350,151	$ (4,888)
Issuance of common stock under employee benefit plans (in Shares)			148,882
Issuance of common stock under employee benefit plans	$ 0		$ (2)	(2)
Stock Issued During Period, Shares, Conversion of Convertible Securities	22,103,031
Stock Issued During Period, Value, Conversion of Convertible Securities	$ 221
Adjustments to Additional Paid in Capital, Convertible Debt with Conversion Feature	0			(221)
Issuance of convertible debt	102,134						$ 102,134	$ 18,689	$ 18,689
Purchase of purchased call options, net of tax	20,118			20,118
Proceeds from the sale of warrants	11,427							11,427
Stock-based compensation expense	1,501			1,501
Adjustments to Additional Paid in Capital, Income Tax Deficiency from Share-based Compensation	(111)			(111)
Dividends declared, Retained Earnings adjustment	(96,655)				(96,655)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	0
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	330,081
Statement of Comprehensive Income [Abstract]
Net Income (Loss) Attributable to Parent	322,244				322,244
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax	(765)	[1]				(765)
Changes in unrealized gains and losses on cash flow hedges, net of tax	4,834
Total comprehensive income	330,081
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	8,602	[2]				8,602
Ending Balance (in shares) at Dec. 31, 2014			162,186,482
Ending Balance at Dec. 31, 2014	460,437		$ 1,622	(119,874)	575,740	2,949
Noncontrolling Interest in Variable Interest Entity	$ 0
Issuance of common stock under employee benefit plans (in Shares)	758,533
Issuance of common stock under employee benefit plans	$ 0		$ (8)	(8)
Stock Issued During Period, Shares, Conversion of Convertible Securities	1,341,600
Stock Issued During Period, Value, Conversion of Convertible Securities	$ 13
Adjustments to Additional Paid in Capital, Convertible Debt with Conversion Feature	100			87
Stock-based compensation expense	2,045
Adjustments to Additional Paid in Capital, Income Tax Deficiency from Share-based Compensation	(233)
Dividends declared, Retained Earnings adjustment	(98,499)				(98,499)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	0
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	332,102
Statement of Comprehensive Income [Abstract]
Net Income (Loss) Attributable to Parent	332,795				332,795
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax	71	[1]				71
Changes in unrealized gains and losses on cash flow hedges, net of tax	4,626
Total comprehensive income	332,102
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	(764)	[2]				(764)
Ending Balance (in shares) at Dec. 31, 2015			164,286,615
Ending Balance at Dec. 31, 2015	695,952		$ 1,643	(117,983)	810,036	2,256
Noncontrolling Interest in Variable Interest Entity	0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 695,952
Issuance of common stock under employee benefit plans (in Shares)	1,251,832
Issuance of common stock under employee benefit plans	$ 0		(12)	(12)
Adjustments to Additional Paid in Capital, Convertible Debt with Conversion Feature	620
Issuance of convertible debt								$ 25,465	$ 25,465
Purchase of purchased call options, net of tax	14,400
Adjustments to Additional Paid in Capital, Other	(3,977)
Stock-based compensation expense	3,741
Dividends declared, Retained Earnings adjustment	(16,526)				(16,526)
Proceeds from Divestiture of Interest in Subsidiaries and Affiliates	250
Noncontrolling Interest, Increase from Subsidiary Equity Issuance	4,227
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	53
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	61,403
Statement of Comprehensive Income [Abstract]
Net Income (Loss) Attributable to Parent	63,606				63,606
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest	53
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	63,659
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax	(435)	[1]				(435)
Changes in unrealized gains and losses on cash flow hedges, net of tax	0
Total comprehensive income	61,350
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	$ (1,821)	[2]				(1,821)
Ending Balance (in shares) at Dec. 31, 2016	165,538,447
Ending Balance at Dec. 31, 2016	$ 751,143		$ 1,655	$ (107,628)	$ 857,116	$ 0
Noncontrolling Interest in Variable Interest Entity	4,280
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 755,423

[1] Net of tax of ($234), $38 and ($412) for the years ended December 31, 2016, 2015 and 2014, respectively.

[2] Net of tax of ($981), ($411) and $4,632 for the years ended December 31, 2016, 2015 and 2014, respectively.