Consolidated Statements Of Stockholders' Equity (Deficit) - USD ($)		Total		Common Stock	Treasury Stock	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
BALANCE (in shares) at Dec. 31, 2015		16,607,516		16,607,516
BALANCE at Dec. 31, 2015		$ (22,074,000)		$ 485,163,000	$ (1,151,063,000)	$ 643,452,000	$ 374,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adjustments related to tax withholding for share-based compensation (in shares)				(48,483)
Adjustments related to tax withholding for share-based compensation		(1,472,000)		$ (1,472,000)
Share-based payments expense (in shares)				650,551
Share-based payments expense		9,678,000		$ 7,876,000	1,802,000
Tax benefit (deficiency) on share-based compensation expense		(1,688,000)		$ (1,688,000)
Net income (loss)		78,999,000				78,999,000
Dividends		(15,313,000)				(15,313,000)
Foreign currency translation adjustment	[1]	$ (2,229,000)	[2],[3]				(2,229,000)
BALANCE (in shares) at Jun. 30, 2016		17,209,584		17,209,584
BALANCE at Jun. 30, 2016		$ 45,901,000		$ 489,879,000	(1,149,261,000)	707,138,000	(1,855,000)
Statement of Stockholders' Equity (Footnote) [Abstract]
Foreign currency translation adjustment, tax effect		0
BALANCE (in shares) at Mar. 31, 2016				17,228,741
BALANCE at Mar. 31, 2016		2,200,000		$ 485,171,000	(1,149,261,000)	666,465,000	(175,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adjustments related to tax withholding for share-based compensation (in shares)				(1,174)
Adjustments related to tax withholding for share-based compensation		(47,000)		$ (47,000)
Share-based payments expense (in shares)				(17,983)
Share-based payments expense		4,360,000		$ 4,360,000	0
Tax benefit (deficiency) on share-based compensation expense		395,000		$ 395,000
Net income (loss)		40,548,000				40,548,000
Dividends		125,000				125,000
Foreign currency translation adjustment	[4]	$ (1,680,000)	[3],[5]				(1,680,000)
BALANCE (in shares) at Jun. 30, 2016		17,209,584		17,209,584
BALANCE at Jun. 30, 2016		$ 45,901,000		$ 489,879,000	$ (1,149,261,000)	$ 707,138,000	$ (1,855,000)
Statement of Stockholders' Equity (Footnote) [Abstract]
Foreign currency translation adjustment, tax effect		$ 0

[1] Foreign currency translation adjustment had no tax effect for the six months ended June 30, 2016.

[2] Foreign currency translation adjustment had no tax effect for the six months ended June 30, 2016.

[3] Foreign currency translation adjustment had no tax effect for the three and six months ended June 30, 2016 and 2015, respectively.

[4] Foreign currency translation adjustment had no tax effect for the three months ended June 30, 2016.

[5] Foreign currency translation adjustment had no tax effect for the three months ended June 30, 2016.