Condensed Consolidated Statements of Stockholders' Deficit (Unaudited) - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid - in Capital [Member]	Retained Deficit [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]
BALANCE at Dec. 31, 2014	$ (659,641)	$ 84	$ 2,155,864	$ (2,772,775)	$ (37,506)	$ (5,308)
BALANCE, shares at Dec. 31, 2014		84,179,806
Net income	179,565			179,565
Dividends declared (cash dividend of $0.675 per share)	(57,369)			(57,369)
Foreign currency translation adjustment, net	(29,436)				(29,436)
Unrealized loss on interest rate derivatives, net	0
Purchase of stock at cost	(59,957)					(59,957)
Purchase of stock at cost, shares		(2,000,000)
Executive Deferred Compensation Plan activity	4,472		4,472
Executive Deferred Compensation Plan activity, shares		70,049
Shares issued from the Employee Stock Purchase Plan	5,707		5,707
Shares issued from the Employee Stock Purchase Plan, shares		208,559
Stock options exercised including related tax benefits	8,335	$ 1	8,334
Stock options exercised including related tax benefits, shares		408,529
Issuance of shares (vesting of restricted shares and Director awards)	(2,742)		(2,742)
Issuance of shares (vesting of restricted shares and Director awards), shares		279,102
Share-based compensation	15,562		15,562
BALANCE at Sep. 30, 2015	(595,504)	$ 85	2,187,197	(2,650,579)	(66,942)	(65,265)
BALANCE, shares at Sep. 30, 2015		83,146,045
BALANCE at Dec. 31, 2015	(552,138)	$ 85	2,193,193	(2,607,415)	(72,736)	(65,265)
BALANCE, shares at Dec. 31, 2015		83,366,888
Net income	125,069			125,069
Dividends declared (cash dividend of $0.675 per share)	(57,305)			(57,305)
Foreign currency translation adjustment, net	(6,448)				(6,448)
Unrealized loss on interest rate derivatives, net	(671)				(671)
Purchase of stock at cost	$ (21,961)					(21,961)
Purchase of stock at cost, shares	(1,000,000)	(1,000,000)
Executive Deferred Compensation Plan activity	$ 1,467		1,467
Executive Deferred Compensation Plan activity, shares		47,352
Shares issued from the Employee Stock Purchase Plan	5,342	$ 1	5,341
Shares issued from the Employee Stock Purchase Plan, shares		294,951
Stock options exercised including related tax benefits	95		95
Stock options exercised including related tax benefits, shares		59,824
Issuance of shares (vesting of restricted shares and Director awards)	(1,924)		(1,924)
Issuance of shares (vesting of restricted shares and Director awards), shares		388,127
Share-based compensation	17,523		17,523
BALANCE at Sep. 30, 2016	$ (490,951)	$ 86	$ 2,215,695	$ (2,539,651)	$ (79,855)	$ (87,226)
BALANCE, shares at Sep. 30, 2016		83,157,142