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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) [Abstract]    
Net income $ 8,260 $ 2,457
Defined benefit pension plans:    
Amortization of prior service costs 32 52
Amortization of net loss 266 490
Other 0 50
Total other comprehensive income 298 592
Comprehensive income $ 8,558 $ 3,049