Consolidated Statements of Changes in Stockholders' Equity - 6 months ended Jun. 30, 2017 - USD ($) $ in Thousands	Common Stock	Additional Paid-in Capital	Retained Earnings	Common Stock Held in Treasury	Accumulated Other Comprehensive Income.	Total
Balance at Dec. 31, 2016	$ 525	$ 248,748	$ 536,350	$ (346,482)	$ (33,977)	$ 405,164
Increase (Decrease) in Stockholders' Equity
Net income			9,945			9,945
Other comprehensive income					6,756	6,756
Issuance of common stock in connection with restricted stock unit awards (1,193,098 shares)	1	(18,733)		18,950		218
Issuance of common stock for the employee stock purchase plan (40,378 shares)		527				527
Shares withheld for net settlements of share-based awards (489,193 shares)				(9,882)		(9,882)
Purchase of common stock for treasury (251,977 shares)				(4,983)		(4,983)
Dividend declared on common stock		10	(4,666)	49		(4,607)
Share-based compensation		10,818				10,818
Cumulative effect of accounting change		866	(643)			223
Balance at Jun. 30, 2017	$ 526	$ 242,236	$ 540,986	$ (342,348)	$ (27,221)	$ 414,179