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Guarantor Infromation (Cash Flows) (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items]      
Net cash (used in) provided by operating activities $ 33,581 $ 28,731  
Cash flow from investing activities:      
(Loans to) repayments from affiliates 0 0  
Capital expenditures (23,028) (22,257)  
Proceeds from derivative instruments 0 (1,171)  
Proceeds from the sale of assets 4,038 685  
Proceeds from divestitures 26,818 0 $ 15,900
Net cash used in investing activities 7,828 (22,743)  
Cash flow from financing activities:      
Loans from (repayments to) affiliates 0    
Loans from (repayments to) affiliates 0 0  
Short-term debt borrowings 5,945 503  
Revolving Facility borrowings 35,000 40,000  
Revolving Facility reductions (77,755) (41,000)  
Principal payments on long term debt (107) (104)  
Revolver facility refinancing 0 (922)  
Net cash provided by financing activities (36,917) (1,523)  
Net change in cash and cash equivalents 4,492 4,465  
Effect of exchange rate changes on cash and cash equivalents 274 755  
Cash and cash equivalents at beginning of period 11,610 6,927 6,927
Cash and cash equivalents at end of period 16,376   11,610
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 9,660 9,568  
Capital expenditures 0 0  
Proceeds from derivative instruments   0  
Proceeds from the sale of assets 0 0  
Proceeds from divestitures 0    
Net cash used in investing activities 9,660 9,568  
Cash flow from financing activities:      
Loans from (repayments to) affiliates (9,660)    
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 14,959 (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 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 (9,660) (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  
Proceeds from divestitures 0    
Net cash used in investing activities 0 0  
Cash flow from financing activities:      
Loans from (repayments to) affiliates 9,660    
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 9,660 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 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 25,784 19,207  
Cash flow from investing activities:      
(Loans to) repayments from affiliates (9,660) (9,568)  
Capital expenditures (2,835) (7,453)  
Proceeds from derivative instruments   0  
Proceeds from the sale of assets 433 458  
Proceeds from divestitures 26,818    
Net cash used in investing activities 14,756 (16,563)  
Cash flow from financing activities:      
Loans from (repayments to) affiliates 0    
Loans from (repayments to) affiliates 0 0  
Short-term debt borrowings 2,803 3  
Revolving Facility borrowings 35,000 35,000  
Revolving Facility reductions (77,755) (36,000)  
Principal payments on long term debt (107) (104)  
Revolver facility refinancing   (922)  
Net cash provided by financing activities (40,059) (2,023)  
Net change in cash and cash equivalents 481 621  
Effect of exchange rate changes on cash and cash equivalents 0 0  
Cash and cash equivalents at beginning of period 636 646 646
Cash and cash equivalents at end of period 1,117   636
Non-Guarantors      
Condensed Financial Statements, Captions [Line Items]      
Net cash (used in) provided by operating activities 42,076 19,092  
Cash flow from investing activities:      
(Loans to) repayments from affiliates 0 0  
Capital expenditures (20,193) (14,804)  
Proceeds from derivative instruments   (1,171)  
Proceeds from the sale of assets 3,605 227  
Proceeds from divestitures 0    
Net cash used in investing activities (16,588) (15,748)  
Cash flow from financing activities:      
Loans from (repayments to) affiliates 0    
Loans from (repayments to) affiliates (24,619) 0  
Short-term debt borrowings 3,142 500  
Revolving Facility borrowings 0 5,000  
Revolving Facility reductions 0 (5,000)  
Principal payments on long term debt 0 0  
Revolver facility refinancing   0  
Net cash provided by financing activities (21,477) 500  
Net change in cash and cash equivalents 4,011 3,844  
Effect of exchange rate changes on cash and cash equivalents 274 755  
Cash and cash equivalents at beginning of period 10,974 $ 6,281 6,281
Cash and cash equivalents at end of period $ 15,259   $ 10,974