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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) [Abstract]    
Net income $ 6,129 $ 8,260
Defined benefit pension plans:    
Amortization of prior service cost 32 32
Amortization of net loss 50 266
Total other comprehensive income 82 298
Comprehensive income $ 6,211 $ 8,558