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CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (UNAUDITED) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Statement of Other Comprehensive Income [Abstract]        
Net income $ 15,382 $ 10,964 $ 10,624 $ 9,743
OTHER COMPREHENSIVE INCOME, NET OF TAX:        
Unrealized gain (loss) on available-for-sale securities 39 65 36 (39)
Amortization of prior service cost and actuarial loss for retirement plan included in net periodic pension costs 170 149 339 297
TOTAL OTHER COMPREHENSIVE INCOME 209 214 375 258
COMPREHENSIVE INCOME $ 15,591 $ 11,178 $ 10,999 $ 10,001