Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Earnings Per Share [Abstract]
Income (loss) from continuing operations		$ (47,351,000)	$ 23,833,000	$ (5,196,000)	$ 51,439,000
Income (loss) from discontinued operations, net of tax		1,735,000	(2,080,000)	(4,821,000)	(6,511,000)
Net income (loss)		(45,616,000)	21,753,000	(10,017,000)	44,928,000
Dividends and undistributed income allocated to participating shares		(121,000)	(817,000)	(269,000)	(1,559,000)
Income (loss) from continuing operations to common shares - basic		(47,472,000)	23,016,000	(5,465,000)	49,880,000
Effect of reallocating undistributed income from continuing operations to participating shares		0	(20,000)	0	(38,000)
Income (loss) from continuing operations to common shares - diluted		$ (47,472,000)	$ 23,036,000	$ (5,465,000)	$ 49,918,000
Weighted average common shares - basic		17,848	19,541	18,057	21,730
Dilutive effect of share-based payment awards		0	98	0	108
Dilutive effect of convertible debt		0	409	0	460
Weighted Average Common Shares, Diluted	[1]	17,848	20,048	18,057	22,298
Basic earnings (loss) per common share:
Continuing operations		$ (2.66)	$ 1.18	$ (0.30)	$ 2.30
Discontinued operations		0.10	(0.11)	(0.27)	(0.30)
Basic earnings (loss) per common share		(2.56)	1.07	(0.57)	2.00
Diluted earnings (loss) per common share:
Continuing operations		(2.66)	1.15	(0.30)	2.24
Discontinued operations		0.10	(0.10)	(0.27)	(0.29)
Diluted earnings (loss) per common share		$ (2.56)	$ 1.05	$ (0.57)	$ 1.95
Stock options and share-based awards not included in diluted EPS calculation because their effect would have be antidilutive		14	2	16	7

[1] Participating securities were included in the calculation of diluted earnings per share using the two-class method, as this calculation was more dilutive than the calculation using the treasury stock method.