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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Statement of Comprehensive Income [Abstract]        
Net income $ 20,422 $ 15,382 $ 24,443 $ 10,624
OTHER COMPREHENSIVE INCOME, NET OF TAX:        
Unrealized gain on available-for-sale securities, net of tax of $6, none, $21 and none, respectively 25 39 37 36
Employee benefit plan:        
Actuarial gain on retirement plan, net of tax of none for all periods presented 0 24 0 47
Amortization of prior service cost and actuarial loss for retirement plan included in net periodic pension costs, net of tax of $52, none, $108 and none, respectively 142 146 184 292
Net change for employee benefit plan 142 170 184 339
TOTAL OTHER COMPREHENSIVE INCOME 167 209 221 375
COMPREHENSIVE INCOME 20,589 15,591 24,664 10,999
Unrealized gain on available-for-sale securities, tax 6 0 21 0
Actuarial gain on retirement plan, tax 0 0 0 0
Amortization of prior service cost and actuarial loss for retirement plan included in net periodic pension costs, tax $ 52 $ 0 $ 108 $ 0