Annual report pursuant to Section 13 and 15(d)

SUPPLEMENTAL INFORMATION FOR STATEMENTS OF CASH FLOWS Schedule of Supplemental Cash Flow Disclosures (Details)

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SUPPLEMENTAL INFORMATION FOR STATEMENTS OF CASH FLOWS Schedule of Supplemental Cash Flow Disclosures (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Supplemental Cash Flow Elements [Abstract]      
Income taxes paid, net of refunds $ 5,960 $ 1,825 $ 20
Interest paid to others, excluding capitalized interest 12,642 13,420 17,839
Schedule of non-cash investing and financing activities:      
Company financed sale of equipment and parts $ 1,248 $ 0 $ 0