Earnings per Share (Schedule of Computation of Basic and Diluted Earnings per Share) (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Earnings Per Share [Abstract]
Income (loss) from continuing operations	$ (7,708)	$ 13,786	$ 18,612	$ 9,029	$ 220	$ 13,632	$ 4,087	$ 5,537	$ 33,719	$ 23,476	$ (81,792)
Loss from discontinued operations	(44)	0	0	0	0	0	0	(28)	(44)	(28)	(32)
Net income (loss)	$ (7,752)	$ 13,786	$ 18,612	$ 9,029	$ 220	$ 13,632	$ 4,087	$ 5,509	$ 33,675	$ 23,448	$ (81,824)
Weighted average shares outstanding (in shares)									31,536	31,233	31,066
Common stock options and restricted stock (in shares)									533	312	0
Weighted average shares and conversions (in shares)									32,069	31,545	31,066