Guarantor Infromation (Cash Flows) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	$ 3,473	$ 11,185
Cash flow from investing activities:
(Loans to) repayments from affiliates	0	0
Capital expenditures	(13,445)	(15,140)
Proceeds from derivative instruments	0	(721)
Proceeds from the sale of assets	3,156	557
Net cash used in investing activities	(10,289)	(15,304)
Cash flow from financing activities:
Loans from (repayments to) affiliates	0
Loans from (repayments to) affiliates	0	0
Short-term debt borrowings	(4,856)	11,004
Revolving Facility borrowings	30,000	32,000
Revolving Facility reductions	(18,000)	(32,000)
Principal payments on long term debt	(71)	(69)
Revolver facility refinancing	0	(922)
Net cash provided by financing activities	7,073	10,013
Net change in cash and cash equivalents	257	5,894
Effect of exchange rate changes on cash and cash equivalents	63	588
Cash and cash equivalents at beginning of period	11,610	6,927
Cash and cash equivalents at end of period	11,930
Consolidating Entries and Eliminations
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	(24,619)	0
Cash flow from investing activities:
(Loans to) repayments from affiliates	9,659	9,568
Capital expenditures	0	0
Proceeds from derivative instruments		0
Proceeds from the sale of assets	0	0
Net cash used in investing activities	9,659	9,568
Cash flow from financing activities:
Loans from (repayments to) affiliates	(9,659)
Loans from (repayments to) affiliates	24,619	(9,568)
Short-term debt borrowings	0	0
Revolving Facility borrowings	0	0
Revolving Facility reductions	0	0
Principal payments on long term debt	0	0
Revolver facility refinancing		0
Net cash provided by financing activities	14,960	(9,568)
Net change in cash and cash equivalents	0	0
Effect of exchange rate changes on cash and cash equivalents	0	0
Cash and cash equivalents at beginning of period	0	0
Cash and cash equivalents at end of period	0
Parent
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	(9,659)	(9,568)
Cash flow from investing activities:
(Loans to) repayments from affiliates	0	0
Capital expenditures	0	0
Proceeds from derivative instruments		0
Proceeds from the sale of assets	0	0
Net cash used in investing activities	0	0
Cash flow from financing activities:
Loans from (repayments to) affiliates	9,659
Loans from (repayments to) affiliates	0	9,568
Short-term debt borrowings	0	0
Revolving Facility borrowings	0	0
Revolving Facility reductions	0	0
Principal payments on long term debt	0	0
Revolver facility refinancing		0
Net cash provided by financing activities	9,659	9,568
Net change in cash and cash equivalents	0	0
Effect of exchange rate changes on cash and cash equivalents	0	0
Cash and cash equivalents at beginning of period	0	0
Cash and cash equivalents at end of period	0
Guarantors
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	(1,514)	14,014
Cash flow from investing activities:
(Loans to) repayments from affiliates	(9,659)	(9,568)
Capital expenditures	(1,497)	(4,825)
Proceeds from derivative instruments		0
Proceeds from the sale of assets	114	458
Net cash used in investing activities	(11,042)	(13,935)
Cash flow from financing activities:
Loans from (repayments to) affiliates	0
Loans from (repayments to) affiliates	0	0
Short-term debt borrowings	802	6,002
Revolving Facility borrowings	30,000	27,000
Revolving Facility reductions	(18,000)	(32,000)
Principal payments on long term debt	(71)	(69)
Revolver facility refinancing		(922)
Net cash provided by financing activities	12,731	11
Net change in cash and cash equivalents	175	90
Effect of exchange rate changes on cash and cash equivalents	0	0
Cash and cash equivalents at beginning of period	636	646
Cash and cash equivalents at end of period	811
Non-Guarantors
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	39,265	6,739
Cash flow from investing activities:
(Loans to) repayments from affiliates	0	0
Capital expenditures	(11,948)	(10,315)
Proceeds from derivative instruments		(721)
Proceeds from the sale of assets	3,042	99
Net cash used in investing activities	(8,906)	(10,937)
Cash flow from financing activities:
Loans from (repayments to) affiliates	0
Loans from (repayments to) affiliates	(24,619)	0
Short-term debt borrowings	(5,658)	5,002
Revolving Facility borrowings	0	5,000
Revolving Facility reductions	0	0
Principal payments on long term debt	0	0
Revolver facility refinancing		0
Net cash provided by financing activities	(30,277)	10,002
Net change in cash and cash equivalents	82	5,804
Effect of exchange rate changes on cash and cash equivalents	63	588
Cash and cash equivalents at beginning of period	10,974	$ 6,281
Cash and cash equivalents at end of period	$ 11,119