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, 2017
Dec. 31, 2016
Guarantees [Abstract]    
Allowance for doubtful accounts-trade $ 1,196 $ 1,219
Par value (in dollars per share) $ 0.01 $ 0.01
Shares authorized 60,000,000 60,000,000
Shares outstanding 21,352,286 20,936,636
Treasury shares 215,141 175,350