CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS EQUITY (USD $) In Thousands	Total	Capital Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Beginning Balance at Dec. 31, 2012	$ 434,152	$ 16,904	$ 74,272	$ 400,784	$ (57,808)
Net income (loss)	12,662			12,662
Other comprehensive income (loss)	13,845				13,845
Stock options exercised	8,091	261	7,830
Stock issued to directors	0	15	(15)
Shares issued for employees stock purchase plan	390	15	375
Shares issued for restricted stock	(1,005)	47	(1,052)
Stock-based compensation expense	2,245		2,245
Ending Balance at Jun. 30, 2013	$ 470,380	$ 17,242	$ 83,655	$ 413,446	$ (43,963)