CONDENSED CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Noncontrolling Interest [Member]	Total
Balance at the beginning of the period at Dec. 31, 2015	$ 398	$ 2,847,823	$ (480,215)	$ (7,889)		$ 3,772	$ 2,363,889
Balance at the beginning of the period, shares at Dec. 31, 2015	39,714,838
Increase (Decrease) in Stockholders' Equity
Net income			150,735				150,735
Interest rate swaps, net of tax				(15,373)			(15,373)	[1]
Pension adjustment, net of tax				(573)			(573)
Capitalized swap interest, net of tax benefit				(317)			(317)	[2]
Stock plan activity		6,057			$ (1,231)		4,826
Stock plan activity, shares	131,198				(12,061)
Balance at the end of the period at Jun. 30, 2016	$ 398	2,853,880	(329,480)	(24,152)	$ (1,231)	3,772	2,503,187
Balance at the end of the period, shares at Jun. 30, 2016	39,846,036				(12,061)
Balance at the beginning of the period at Dec. 31, 2016	$ 398	2,853,269	(277,912)	(6,786)	$ (1,231)	3,772	2,571,510
Balance at the beginning of the period, shares at Dec. 31, 2016	39,802,064				(12,061)
Increase (Decrease) in Stockholders' Equity
Net income			8,779				8,779
Interest rate swaps, net of tax				(2,250)			(2,250)	[1]
Capitalized swap interest, net of tax benefit				(121)			(121)	[2]
Stock plan activity	$ 3	14,491			$ (532)		13,962
Stock plan activity, shares	347,583				(4,321)
Exercise of warrants	$ 31	375,582					375,613
Exercise of warrants (in shares)	3,052,453
Balance at the end of the period at Jun. 30, 2017	$ 432	$ 3,243,342	$ (269,133)	$ (9,157)	$ (1,763)	$ 3,772	$ 2,967,493
Balance at the end of the period, shares at Jun. 30, 2017	43,202,100				(16,382)

[1] Net of deferred tax benefit of $1.5 million and $3.0 million for the three months ended June 30, 2017 and 2016, respectively, $1.2 million and $8.3 million for the six months ended June 30, 2017 and 2016, respectively.

[2] The deferred tax impact was immaterial for the three months ended June 30, 2017 and 2016, respectively. Amount is net of deferred tax benefit of $0.1 million for the six months ended June 30, 2017 and 2016, respectively.