Consolidated Statements of Stockholders' Deficit - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid - in Capital [Member]	Retained Deficit [Member]	Accumulated Other Comprehensive (Loss) [Member]	Treasury Stock [Member]
BALANCE at Dec. 31, 2013	$ (740,172)	$ 84	$ 2,132,441	$ (2,855,189)	$ (12,200)	$ (5,308)
BALANCE, shares at Dec. 31, 2013	83,653,215
Net income	$ 158,405			158,405
Dividends declared (cash dividend/$0.90 per share)	(75,991)			(75,991)
Other comprehensive loss, net of tax of (13,662 - 2014, 19,903 - 2015, 7,749 - 2016)	(25,306)				(25,306)
Executive Deferred Compensation Plan activity, net	$ 3,474		3,474
Executive Deferred Compensation Plan activity, shares	62,489
Stock options exercised including related tax benefits	$ 1,165		1,165
Stock options exercised including related tax benefits, shares	112,216
Shares issued from the Employee Stock Purchase Plan	$ 6,037		6,037
Shares issued from the Employee Stock Purchase Plan, shares	271,255
Issuance of shares (vesting of restricted shares and Director awards)	$ (399)		(399)
Issuance of shares (vesting of restricted shares and Director awards), shares	80,631
Share based compensation	$ 13,146		13,146
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	$ 241,840			241,840
Dividends declared (cash dividend/$0.90 per share)	(76,480)			(76,480)
Other comprehensive loss, net of tax of (13,662 - 2014, 19,903 - 2015, 7,749 - 2016)	(35,230)				(35,230)
Purchase of stock at cost	$ (59,957)					(59,957)
Purchase of stock at cost, shares	(2,000,000)
Executive Deferred Compensation Plan activity, net	$ 3,638		3,638
Executive Deferred Compensation Plan activity, shares	204,323
Stock options exercised including related tax benefits	$ 8,581	1	8,580
Stock options exercised including related tax benefits, shares	413,008
Shares issued from the Employee Stock Purchase Plan	$ 7,184		7,184
Shares issued from the Employee Stock Purchase Plan, shares	286,141
Issuance of shares (vesting of restricted shares and Director awards)	$ (2,940)		(2,940)
Issuance of shares (vesting of restricted shares and Director awards), shares	283,610
Share based compensation	$ 20,867		20,867
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	$ 193,389			193,389
Dividends declared (cash dividend/$0.90 per share)	(76,429)			(76,429)
Other comprehensive loss, net of tax of (13,662 - 2014, 19,903 - 2015, 7,749 - 2016)	(14,897)				(14,897)
Purchase of stock at cost	$ (21,961)					(21,961)
Purchase of stock at cost, shares	(1,000,000)
Executive Deferred Compensation Plan activity, net	$ 2,493		2,493
Executive Deferred Compensation Plan activity, shares	47,352
Stock options exercised including related tax benefits	$ 91		91
Stock options exercised including related tax benefits, shares	69,336
Shares issued from the Employee Stock Purchase Plan	$ 7,110	1	7,109
Shares issued from the Employee Stock Purchase Plan, shares	389,158
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	392,178
Share based compensation	$ 22,417		22,417
BALANCE at Dec. 31, 2016	$ (441,849)	$ 86	$ 2,223,379	$ (2,490,455)	$ (87,633)	$ (87,226)
BALANCE, shares at Dec. 31, 2016	83,264,912