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Shareholders' Equity (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Class of Stock [Line Items]    
Shareholders' Equity - January 1 $ 67,865 $ 24,895
Net income (loss) (6,376) 11,647
Other comprehensive income 5,735 (16,293)
Exercise of stock options or warrants 0 246
Stock-based compensation expense 2,475 1,593
Shareholders' Equity - March 31 $ 69,699 $ 22,246