Annual report pursuant to Section 13 and 15(d)

NATURE OF OPERATIONS AND ACCOUNTING POLICIES Recent Accounting Pronouncements (Details)

v3.8.0.1
NATURE OF OPERATIONS AND ACCOUNTING POLICIES Recent Accounting Pronouncements (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Debt issuance costs $ 2,067 $ 2,395
Long-term Debt | Accounting Standards Update 2015-03    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Debt issuance costs $ 2,400 $ 2,700