Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Per Share data, unless otherwise specified	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Beginning Balance at Dec. 31, 2011	$ 3,578,040	$ 2,136	$ 3,015,349	$ (53,848)	$ 622,353	$ (7,950)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Total comprehensive income (loss)	(692,512)	0	0	0	(683,955)	(8,557)
Other Comprehensive Income (Loss), Net of Tax	(8,552)
Dividends declared per common share	$ 0.20
Dividends, Common Stock	(42,440)	0	0	0	(42,440)	0
Redemption of noncontrolling interest	(5,474)	0	(5,474)	0	0	0
Issuance of shares of common stock under the stock incentive plan — restricted stock and restricted stock units, net of forfeitures	0	0	0	0	0	0
Issuance of shares of common stock under the stock incentive plan — stock options including income tax benefits	5,131	5	5,126	0	0	0
Employee stock-based compensation expense	11,822	0	11,822	0	0	0
Ending Balance at Dec. 31, 2012	2,854,567	2,141	3,026,823	(53,848)	(104,042)	(16,507)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Total comprehensive income (loss)	(587,633)	0	0	0
Other Comprehensive Income (Loss), Net of Tax	54,199
Dividends declared per common share	$ 0.12
Dividends, Common Stock	(25,475)	0	0	0	(25,475)	0
Issuance of shares of common stock under the stock incentive plan — restricted stock and restricted stock units, net of forfeitures	0	0	0	0	0	0
Employee stock-based compensation expense	11,790	0		0	0	0
Ending Balance at Dec. 31, 2013	2,253,249	2,141	3,038,613	(53,848)	(771,349)	37,692
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Total comprehensive income (loss)	(592,804)	0	0	0
Other Comprehensive Income (Loss), Net of Tax	(34,451)
Dividends declared per common share	$ 0.01
Dividends, Common Stock	(2,123)	0	0	0	(2,123)	0
Treasury shares purchased	(15)	0	0	(15)	0	0
Employee stock-based compensation expense	9,847	0		0	0	0
Ending Balance at Dec. 31, 2014	$ 1,668,154	$ 2,141	$ 3,048,460	$ (53,863)	$ (1,331,825)	$ 3,241