Summary of Significant Accounting Policies - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Numerator:
Income from continuing operations	$ 13,545	$ 7,995	$ 30,923	$ 20,337
Income from discontinued operations, net of tax	0	57,023	0	61,633
Net income	$ 13,545	$ 65,018	$ 30,923	$ 81,970
Denominator:
Weighted average shares outstanding – basic (in shares)	27,811	31,347	28,072	32,267
Common stock equivalents (in shares)	321	206	246	228
Weighted average shares outstanding – diluted (in shares)	28,132	31,553	28,318	32,495
Earnings per share – basic:
From continuing operations (in dollars per share)	$ 0.49	$ 0.26	$ 1.10	$ 0.63
From discontinued operations (in dollars per share)	0.00	1.81	0.00	1.91
Earnings per share – basic (in dollars per share)	0.49	2.07	1.10	2.54
Earnings per share – diluted:
From continuing operations (in dollars per share)	0.48	0.25	1.09	0.63
From discontinued operations (in dollars per share)	0.00	1.81	0.00	1.89
Earnings per share – diluted (in dollars per share)	$ 0.48	$ 2.06	$ 1.09	$ 2.52