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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Valuation and Qualifying Accounts, Activity for the years ended December 31, 2015, 2014 and 2013 was as follows:      
Balance at Beginning of Year $ 10,353 $ 8,668 $ 608
Additions, Charged to Costs and Expenses 1,260 1,685 7,100
Additions, Charged to Other Accounts 0 0 960
Deductions 1,000 0 0
Balance at End of Year 10,613 10,353 8,668
Allowance for doubtful accounts [Member]      
Valuation and Qualifying Accounts, Activity for the years ended December 31, 2015, 2014 and 2013 was as follows:      
Balance at Beginning of Year 726 608 608
Additions, Charged to Costs and Expenses 0 118 0
Additions, Charged to Other Accounts 0 0 0
Deductions 0 0 0
Balance at End of Year 726 726 608
Deferred tax valuation allowance [Member]      
Valuation and Qualifying Accounts, Activity for the years ended December 31, 2015, 2014 and 2013 was as follows:      
Balance at Beginning of Year 9,627 8,060 0
Additions, Charged to Costs and Expenses $ 1,260 1,567 7,100
Additions, Charged to Other Accounts 0 960
Deductions $ 1,000 0 0
Balance at End of Year $ 9,887 $ 9,627 $ 8,060