Annual report pursuant to Section 13 and 15(d)

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

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NATURE OF OPERATIONS AND ACCOUNTING POLICIES Recent Accounting Pronouncements (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Debt issuance costs $ 2,395 $ 2,740
Other Assets | Accounting Standards Update 2015-03    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Debt issuance costs (2,395) (2,740)
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