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, 2016
Dec. 31, 2015
Guarantees [Abstract]    
Allowance for doubtful accounts-trade $ 1,219 $ 2,103
Par value (in dollars per share) $ 0.01 $ 0.01
Shares authorized 60,000,000 60,000,000
Shares outstanding 20,936,636 20,495,694
Treasury shares 175,350 154,549