CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (USD $)
In Thousands, unless otherwise specified
Total
Capital Stock [Member]
Additional Paid-In Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Beginning Balance at Dec. 31, 2014 $ 581,963 $ 18,404 $ 137,225 $ 491,428 $ (65,094)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 13,627     13,627  
Other comprehensive income (loss) (27,494)       (27,494)
Stock options exercised 5,290 137 5,153    
Shares issued for employees stock purchase plan 345 6 339    
Shares issued for restricted stock (2,258) 58 (2,316)    
Stock-based compensation expense 1,598   1,598    
Ending Balance at Mar. 31, 2015 $ 573,071 $ 18,605 $ 141,999 $ 505,055 $ (92,588)