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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME [Abstract]      
Net income $ 32,265 $ 14,911 $ 15,463
Defined benefit pension plans:      
Net gain (loss) during year 10,943 339 (10,315)
Amortization of prior service cost 210 210 210
Amortization of net loss 1,695 1,873 947
Tax (4,882) (921) 3,389
Total accumulated other comprehensive income (loss) before the effect of income taxes 7,966 1,501 (5,769)
Other comprehensive income 0 117 201
Total other comprehensive income (loss) 7,966 1,618 (5,568)
Total comprehensive income $ 40,231 $ 16,529 $ 9,895