Consolidated Statements of Changes in Stockholders' Equity (USD $) In Thousands, except Share data	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Loss [Member]
Balance, beginning at Dec. 31, 2012	$ 191,529	$ 396	$ 102,409	$ 170,092	$ (39,918)	$ (41,450)
Balance, Shares beginning at Dec. 31, 2012		35,635,357
Stock-based compensation	1,028		1,028
Exercise of stock options	1,819	2	1,817
Exercise of stock options, Shares		246,673
Exercise of warrants	2,762	2	2,760
Exercise of warrants, Shares		175,236
Acquisition of treasury stock	(6,000)				(6,000)
Acquisition of treasury stock, Shares		(375,884)
Other comprehensive income (loss), net	16,625					16,625
Net loss	(42,257)			(42,257)
Balance, ending at Jun. 30, 2013	165,506	400	108,014	127,835	(45,918)	(24,825)
Balance, Shares ending at Jun. 30, 2013		35,681,382
Balance, beginning at Dec. 31, 2013	81,541	406	116,222	105,889	(90,918)	(50,058)
Balance, Shares beginning at Dec. 31, 2013	34,048,366	34,048,366
Stock-based compensation	1,072		1,072
Exercise of stock options	48		48
Exercise of stock options, Shares		6,795
Exercise of warrants	19		19
Exercise of warrants, Shares		1,202
Other comprehensive income (loss), net	(16,460)					(16,460)
Net loss	(6,595)			(6,595)
Balance, ending at Jun. 30, 2014	$ 59,625	$ 406	$ 117,361	$ 99,294	$ (90,918)	$ (66,518)
Balance, Shares ending at Jun. 30, 2014	34,056,363	34,056,363