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ACCUMULATED OTHER COMPREHENSIVE LOSS - Schedule of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
BALANCE $ 466,765 $ 448,742 $ 427,686
Other comprehensive loss before reclassification (1,931) (471) (389)
Plan amendment cost   (5,963)  
Reclassification to net income [1] 1,084 997 375
TOTAL OTHER COMPREHENSIVE LOSS (847) (5,437) (14)
BALANCE 528,468 466,765 448,742
Unrealized (loss) on available-for-sale securities [Member]      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
BALANCE (111) (28) (24)
Other comprehensive loss before reclassification (135) (83) (4)
TOTAL OTHER COMPREHENSIVE LOSS (135) (83) (4)
BALANCE (246) (111) (28)
Net unrealized gain (loss) on retirement plan [Member]      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
BALANCE [2] (9,708) (4,354) (4,344)
Other comprehensive loss before reclassification [2] (1,731) (388) (385)
Plan amendment cost [2]   (5,963)  
Reclassification to net income [1],[2] 1,084 997 375
TOTAL OTHER COMPREHENSIVE LOSS [2] (647) (5,354) (10)
BALANCE [2] (10,355) (9,708) (4,354)
Change in cumulative foreign currency translation adjustment [Member]      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Other comprehensive loss before reclassification (65)    
TOTAL OTHER COMPREHENSIVE LOSS (65)    
BALANCE (65)    
Accumulated Other Comprehensive Loss [Member]      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
BALANCE (9,819) (4,382) (4,368)
TOTAL OTHER COMPREHENSIVE LOSS (847) (5,437) (14)
BALANCE $ (10,666) $ (9,819) $ (4,382)
[1] The Company reclassified amortization of plan amendment cost, prior service cost, and actuarial loss for its retirement plan from accumulated other comprehensive loss to net income of $1.1 million, $1.0 million, and $375,000 for the years ended December 31, 2016, 2015, and 2014, respectively.
[2] Refer to Note 15: Employee Retirement Plans