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Guarantor Infromation (Cash Flows) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Condensed Financial Statements, Captions [Line Items]    
Net cash (used in) provided by operating activities $ 1,817 $ 9,724
Cash flow from investing activities:    
(Loans to) repayments from affiliates 0 0
Capital expenditures (7,996) (8,414)
Proceeds from derivative instruments 0 (253)
Proceeds from the sale of assets 368 404
Net cash used in investing activities (7,628) (8,263)
Cash flow from financing activities:    
Loans from (repayments to) affiliates 0  
Loans from (repayments to) affiliates   0
Short-term debt borrowings (498) 5,001
Revolving Facility borrowings 13,000 19,000
Revolving Facility reductions 0 (23,000)
Principal payments on long term debt (36) (34)
Net cash provided by financing activities 12,466 967
Net change in cash and cash equivalents 6,655 2,428
Effect of exchange rate changes on cash and cash equivalents 216 477
Cash and cash equivalents at beginning of period 11,610 6,927
Cash and cash equivalents at end of period 18,481 9,832
Consolidating Entries and Eliminations    
Condensed Financial Statements, Captions [Line Items]    
Net cash (used in) provided by operating activities 0 0
Cash flow from investing activities:    
(Loans to) repayments from affiliates 96 6
Capital expenditures 0 0
Proceeds from derivative instruments   0
Proceeds from the sale of assets 0 0
Net cash used in investing activities 96 6
Cash flow from financing activities:    
Loans from (repayments to) affiliates (96)  
Loans from (repayments to) affiliates   (6)
Short-term debt borrowings 0 0
Revolving Facility borrowings 0 0
Revolving Facility reductions   0
Principal payments on long term debt 0 0
Net cash provided by financing activities (96) (6)
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 0
Parent    
Condensed Financial Statements, Captions [Line Items]    
Net cash (used in) provided by operating activities (96) (6)
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 96  
Loans from (repayments to) affiliates   6
Short-term debt borrowings 0 0
Revolving Facility borrowings 0 0
Revolving Facility reductions   0
Principal payments on long term debt 0 0
Net cash provided by financing activities 96 6
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 0
Guarantors    
Condensed Financial Statements, Captions [Line Items]    
Net cash (used in) provided by operating activities (11,077) 8,007
Cash flow from investing activities:    
(Loans to) repayments from affiliates (96) (6)
Capital expenditures (1,069) (3,828)
Proceeds from derivative instruments   0
Proceeds from the sale of assets 4 391
Net cash used in investing activities (1,161) (3,443)
Cash flow from financing activities:    
Loans from (repayments to) affiliates 0  
Loans from (repayments to) affiliates   0
Short-term debt borrowings (699) 1
Revolving Facility borrowings 13,000 19,000
Revolving Facility reductions   (23,000)
Principal payments on long term debt (36) (34)
Net cash provided by financing activities 12,265 (4,033)
Net change in cash and cash equivalents 27 531
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 663 1,177
Non-Guarantors    
Condensed Financial Statements, Captions [Line Items]    
Net cash (used in) provided by operating activities 12,990 1,723
Cash flow from investing activities:    
(Loans to) repayments from affiliates 0 0
Capital expenditures (6,927) (4,586)
Proceeds from derivative instruments   (253)
Proceeds from the sale of assets 364 13
Net cash used in investing activities (6,563) (4,826)
Cash flow from financing activities:    
Loans from (repayments to) affiliates 0  
Loans from (repayments to) affiliates   0
Short-term debt borrowings 201 5,000
Revolving Facility borrowings 0 0
Revolving Facility reductions   0
Principal payments on long term debt 0 0
Net cash provided by financing activities 201 5,000
Net change in cash and cash equivalents 6,628 1,897
Effect of exchange rate changes on cash and cash equivalents 216 477
Cash and cash equivalents at beginning of period 10,974 6,281
Cash and cash equivalents at end of period $ 17,818 $ 8,655