Annual report pursuant to Section 13 and 15(d)

GUARANTORS OF SECURITIES Supplemental Condensed Consolidating Balance Sheet Additional Information (Details)

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GUARANTORS OF SECURITIES Supplemental Condensed Consolidating Balance Sheet Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Jan. 31, 2013
Guarantees [Abstract]      
Allowance for doubtful accounts-trade $ 2,103 $ 1,955  
Allowance for doubtful accounts-other $ 0 $ 437  
Par value (in dollars per share) $ 0.01 $ 0.01 $ 0.01
Shares authorized 60,000,000 60,000,000  
Shares outstanding 20,495,694 20,371,672  
Treasury shares 154,549 18,609