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Consolidated Statements of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Net income $ 21,393 $ 20,044
Other comprehensive income (loss), before tax:    
Change in net unrealized gains (losses) during period 14,351 (5,717)
Reclassification adjustment for net gains included in income (71) (8)
Defined benefit post-retirement benefits plans:    
Change in net actuarial loss 35 35
Other comprehensive income (loss), before tax 14,315 (5,690)
Deferred tax benefit (expense) related to other comprehensive income (5,633) 2,239
Other comprehensive income (loss), net of tax 8,682 (3,451)
Comprehensive income, net of tax $ 30,075 $ 16,593