CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (USD $) In Thousands, except Share data	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]
Balance at Dec. 31, 2011	$ 704,679	$ 7,444	$ (908,667)	$ 409,190	$ (56,406)	$ 1,253,118
Balance (in Shares) at Dec. 31, 2011		74,435,628	(32,281,847)
Net income	111,830					111,830
Unrealized translation adjustments	1,567				1,567
Minimum pension liability adjustments, net of tax benefit (loss) of $2,847, $8,397 and $10,853 in 2012, 2013 and 2014 respectively	(4,645)				(4,645)
Unrealized benefit on interest rate swaps, net of tax loss of $3,505, $1,008 and $0 in 2012, 2013 and 2014 respectively	5,719				5,719
Comprehensive income	114,471				2,641	111,830
Cash dividend declared, $0.53 per share, $0.56 per share and $ per share in 2012, 2013 and 2014 respectively	(21,511)					(21,511)
Acquisition of treasury stock	(69,908)		(69,908)
Acquisition of treasury stock (in shares)			(2,454,037)
Stock compensation	10,361		15,355	(4,994)
Stock compensation (in shares)	619,664		619,664
Balance at Dec. 31, 2012	738,092	7,444	(963,220)	404,196	(53,765)	1,343,437
Balance (in Shares) at Dec. 31, 2012		74,435,628	(34,116,220)
Net income	123,170					123,170
Unrealized translation adjustments	(901)				(901)
Minimum pension liability adjustments, net of tax benefit (loss) of $2,847, $8,397 and $10,853 in 2012, 2013 and 2014 respectively	13,194				13,194
Unrealized benefit on interest rate swaps, net of tax loss of $3,505, $1,008 and $0 in 2012, 2013 and 2014 respectively	1,584				1,584
Comprehensive income	137,047				13,877	123,170
Cash dividend declared, $0.53 per share, $0.56 per share and $ per share in 2012, 2013 and 2014 respectively	(22,369)					(22,369)
Acquisition of treasury stock	(62,056)		(62,056)
Acquisition of treasury stock (in shares)	(1,684,365)		(1,684,365)
Stock compensation	34,800		27,042	7,758
Stock compensation (in shares)	1,086,502		1,086,502
Balance at Dec. 31, 2013	825,514	7,444	(998,234)	411,954	(39,888)	1,444,238
Balance (in Shares) at Dec. 31, 2013		74,435,628	(34,714,083)
Net income	119,198					119,198
Unrealized translation adjustments	(5,262)				(5,262)
Minimum pension liability adjustments, net of tax benefit (loss) of $2,847, $8,397 and $10,853 in 2012, 2013 and 2014 respectively	(17,044)				(17,044)
Unrealized benefit on interest rate swaps, net of tax loss of $3,505, $1,008 and $0 in 2012, 2013 and 2014 respectively	(597)				(597)
Comprehensive income	96,295				(22,903)	119,198
Cash dividend declared, $0.53 per share, $0.56 per share and $ per share in 2012, 2013 and 2014 respectively	(21,761)					(21,761)
Acquisition of treasury stock	(50,591)		(50,591)
Acquisition of treasury stock (in shares)	(1,255,705)		(1,255,705)
Stock compensation	6,661		6,324	337
Stock compensation (in shares)	250,747		250,747
Balance at Dec. 31, 2014	$ 856,118	$ 7,444	$ (1,042,501)	$ 412,291	$ (62,791)	$ 1,541,675
Balance (in Shares) at Dec. 31, 2014		74,435,628	(35,719,041)