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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, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share [Abstract]
Income from continuing operations	$ 13,117	$ 19,503	$ 22,837	$ 8,352	$ 25,176	$ 20,619	$ 13,174	$ 3,996	$ 63,809	$ 62,965	$ 33,719
Loss from discontinued operations					0	0	(405)	0	0	(405)	(44)
Net income	$ 13,117	$ 19,503	$ 22,837	$ 8,352	$ 25,176	$ 20,619	$ 12,769	$ 3,996	$ 63,809	$ 62,560	$ 33,675
Weighted average shares outstanding (in shares)									31,979	31,701	31,536
Common stock options and restricted stock (in shares)									555	549	533
Weighted average shares and conversions (in shares)									32,534	32,250	32,069

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