UNAUDITED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Shares Held Under Employee Participation Plan	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Accumulated Earnings
Increase (Decrease) in Stockholders' Equity
Cumulative effect of change in accounting for stock based compensation	$ 231			$ 681		$ (450)
Balance at beginning of period at Dec. 31, 2016	1,084,241	$ 573	$ (469)	725,670	$ (214,326)	572,793
Balance beginning of period (in shares) at Dec. 31, 2016		57,298
Increase (Decrease) in Stockholders' Equity
Net income (loss)	4,487					4,487
Other comprehensive income	21,149				21,149
Stock-based compensation	5,172			5,172
Issuance of restricted shares, net of shares remitted	(2,132)	$ 1		(2,133)
Issuance of restricted shares, net of shares remitted (in shares)		93
Shares held under employee participation plan	0	$ 0	469	(469)
Shares held under employee participation plan (in shares)		(25)
Repurchases of common stock	$ (12,257)	$ (2)		(12,255)
Repurchases of common stock (in shares)	(200)	(214)
Exercise of stock options	$ 46			46
Exercise of stock options (in shares)		2
Balance at end of period at Jun. 30, 2017	$ 1,100,937	$ 572	$ 0	$ 716,712	$ (193,177)	$ 576,830
Balance ending of period (in shares) at Jun. 30, 2017		57,154