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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) [Abstract]        
Net income $ 7,824 $ 9,494 $ 18,781 $ 22,584
Defined benefit pension plans:        
Amortization of prior service cost 33 33 97 97
Amortization of net loss 49 255 147 787
Total other comprehensive income 82 288 244 884
Comprehensive income $ 7,906 $ 9,782 $ 19,025 $ 23,468