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Separate Financial Information of Guarantor Subsidiaries Balance Sheet (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Current Assets:            
Cash and Cash Equivalents $ 55,947 $ 58,033 $ 42,283 $ 51,300 $ 92,962 $ 80,984
Restricted Cash 1,292 517   640    
Net Receivables 193,725 149,134   140,445    
Intercompany Receivables 0 0   0    
Inventories 141,519 78,622   77,292    
Prepaid Expenses 26,281 9,204   14,656    
Other Current Assets 4,909 2,412   2,485    
Assets Held for Sale   0   6,826    
Total Current Assets 423,673 297,922   293,644    
Property, Plant and Equipment 389,391 298,500   276,811    
Accumulated Depreciation (207,882) (186,403)   (181,853)    
Property, Plant and Equipment, Net 181,509 112,097   94,958    
Deferred Income Taxes 19,857 13,439   12,051    
Investment in Affiliates 0 0   0    
Intercompany Loans 0 0   0    
Goodwill 179,048 21,065   16,803 18,355  
Intangible Assets, Net 175,752 6,460   3,195    
Other Assets 22,959 19,054   11,644    
Total Assets 1,002,798 470,037   432,295    
Current Liabilities:            
Current Portion of Long-Term Debt 5,281 3,459   3,459    
Accounts Payable 88,618 47,408   50,350    
Intercompany Payables 0 0   0    
Employee Compensation and Benefits 35,085 35,997   34,528    
Income Taxes Payable 10,599 2,348   1,398    
Other Current Liabilities 63,327 43,617   43,027    
Liabilities Held for Sale   0   454    
Total Current Liabilities 202,910 132,829   133,216    
Long-Term Liabilities:            
Long-Term Debt 383,252 32,735   21,194    
Intercompany Loans 0 0   0    
Employee-Related Benefits 25,247 21,134   21,508    
Deferred Income Taxes 62,167 171   5    
Other Liabilities 32,686 4,625   4,165    
Total Long-Term Liabilities 503,352 58,665   46,872    
Total Liabilities 706,262 191,494   180,088    
Preferred Stock 0 0   0    
Common Stock 6,690 6,633   6,654    
Stockholders' Equity Attributable to Noncontrolling Interest 2,223 0        
Additional Paid-In Capital 12,062 3,653   0    
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 296,536 278,543        
Retained Earnings 303,987 318,180   293,682    
Accumulated Other Comprehensive Loss (28,426) (49,923)   (48,129) (38,593)  
Total Shareholders' Equity 294,313 278,543   252,207 280,651 263,846
Total Liabilities and Shareholders' Equity 1,002,798 470,037   432,295    
Parent            
Current Assets:            
Cash and Cash Equivalents 10,171 38,484 20,216 35,834 75,235 68,014
Restricted Cash 0 0   0    
Net Receivables 194 209   956    
Intercompany Receivables 71,221 50,437   38,265    
Inventories 32,929 26,422   29,648    
Prepaid Expenses 17,884 4,120   8,683    
Other Current Assets 4,367 2,402   2,439    
Assets Held for Sale       178    
Total Current Assets 136,766 122,074   116,003    
Property, Plant and Equipment 233,464 225,651   206,667    
Accumulated Depreciation (153,364) (144,281)   (134,719)    
Property, Plant and Equipment, Net 80,100 81,370   71,948    
Deferred Income Taxes 3,356 3,048   0    
Investment in Affiliates 374,353 157,004   113,341    
Intercompany Loans 307,090 130,000   141,403    
Goodwill 12,869 12,869   12,870    
Intangible Assets, Net 2,237 0   0    
Other Assets 13,255 10,189   9,304    
Total Assets 930,026 516,554   464,869    
Current Liabilities:            
Current Portion of Long-Term Debt 4,887 3,429   3,429    
Accounts Payable 36,777 30,867   32,338    
Intercompany Payables 134,053 125,540   109,753    
Employee Compensation and Benefits 8,538 12,025   13,307    
Income Taxes Payable 426 1,410   0    
Other Current Liabilities 25,517 15,329   15,222    
Liabilities Held for Sale       0    
Total Current Liabilities 210,198 188,600   174,049    
Long-Term Liabilities:            
Long-Term Debt 382,975 32,714   21,143    
Intercompany Loans 0 0   0    
Employee-Related Benefits 12,329 14,291   15,255    
Deferred Income Taxes 0 0   0    
Other Liabilities 27,988 2,406   2,215    
Total Long-Term Liabilities 423,292 49,411   38,613    
Total Liabilities 633,490 238,011   212,662    
Preferred Stock 0 0   0    
Common Stock 6,690 6,633   6,654    
Stockholders' Equity Attributable to Noncontrolling Interest 2,223          
Additional Paid-In Capital 12,062 3,653   0    
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 296,536          
Retained Earnings 303,987 318,180   293,682    
Accumulated Other Comprehensive Loss (28,426) (49,923)   (48,129)    
Total Shareholders' Equity 294,313 278,543   252,207    
Total Liabilities and Shareholders' Equity 930,026 516,554   464,869    
Guarantor Subsidiaries            
Current Assets:            
Cash and Cash Equivalents 1,024 226 460 0 0 0
Restricted Cash 0 0   0    
Net Receivables 79,978 85,219   77,087    
Intercompany Receivables 129,405 123,289   109,753    
Inventories 15,219 12,821   10,626    
Prepaid Expenses 813 1,151   1,307    
Other Current Assets 0 0   0    
Assets Held for Sale       0    
Total Current Assets 226,439 222,706   198,773    
Property, Plant and Equipment 13,013 12,996   9,405    
Accumulated Depreciation (6,891) (6,175)   (6,153)    
Property, Plant and Equipment, Net 6,122 6,821   3,252    
Deferred Income Taxes 3,974 3,281   5,517    
Investment in Affiliates 10,978 9,021   6,917    
Intercompany Loans 0 0   0    
Goodwill 1,739 1,439   0    
Intangible Assets, Net 2,951 3,200   0    
Other Assets 0 27   0    
Total Assets 252,203 246,495   214,459    
Current Liabilities:            
Current Portion of Long-Term Debt 0 0   0    
Accounts Payable 2,557 2,599   2,730    
Intercompany Payables 130 1,249   0    
Employee Compensation and Benefits 9,457 15,261   13,570    
Income Taxes Payable 0 0   0    
Other Current Liabilities 14,022 13,348   11,627    
Liabilities Held for Sale       0    
Total Current Liabilities 26,166 32,457   27,927    
Long-Term Liabilities:            
Long-Term Debt 0 0   0    
Intercompany Loans 128,000 128,000   120,000    
Employee-Related Benefits 3,775 3,704   3,782    
Deferred Income Taxes 0 0   0    
Other Liabilities 1,843 1,295   1,173    
Total Long-Term Liabilities 133,618 132,999   124,955    
Total Liabilities 159,784 165,456   152,882    
Preferred Stock 0 0   0    
Common Stock 0 0   0    
Stockholders' Equity Attributable to Noncontrolling Interest 0          
Additional Paid-In Capital 72,483 72,483   68,913    
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 92,419          
Retained Earnings 20,458 9,771   (5,852)    
Accumulated Other Comprehensive Loss (522) (1,215)   (1,484)    
Total Shareholders' Equity 92,419 81,039   61,577    
Total Liabilities and Shareholders' Equity 252,203 246,495   214,459    
Non-Guarantor Subsidiaries            
Current Assets:            
Cash and Cash Equivalents 44,752 19,323 21,607 15,466 17,727 12,970
Restricted Cash 1,292 517   640    
Net Receivables 113,553 63,706   62,402    
Intercompany Receivables 4,013 2,251   0    
Inventories 103,829 49,829   47,567    
Prepaid Expenses 7,584 3,933   4,666    
Other Current Assets 542 10   46    
Assets Held for Sale       6,648    
Total Current Assets 275,565 139,569   137,435    
Property, Plant and Equipment 142,914 59,853   60,739    
Accumulated Depreciation (47,627) (35,947)   (40,981)    
Property, Plant and Equipment, Net 95,287 23,906   19,758    
Deferred Income Taxes 12,527 7,110   6,534    
Investment in Affiliates 0 0   0    
Intercompany Loans 0 0   0    
Goodwill 164,440 6,757   3,933    
Intangible Assets, Net 170,564 3,260   3,195    
Other Assets 9,704 8,838   2,340    
Total Assets 728,087 189,440   173,195    
Current Liabilities:            
Current Portion of Long-Term Debt 394 30   30    
Accounts Payable 49,284 13,942   15,282    
Intercompany Payables 70,456 49,188   38,265    
Employee Compensation and Benefits 17,090 8,711   7,651    
Income Taxes Payable 10,173 938   1,398    
Other Current Liabilities 23,788 14,940   16,178    
Liabilities Held for Sale       454    
Total Current Liabilities 171,185 87,749   79,258    
Long-Term Liabilities:            
Long-Term Debt 277 21   51    
Intercompany Loans 179,090 2,000   21,403    
Employee-Related Benefits 9,143 3,139   2,471    
Deferred Income Taxes 62,167 171   5    
Other Liabilities 2,855 924   777    
Total Long-Term Liabilities 253,532 6,255   24,707    
Total Liabilities 424,717 94,004   103,965    
Preferred Stock 0 0   0    
Common Stock 11,131 11,131   11,116    
Stockholders' Equity Attributable to Noncontrolling Interest 2,223          
Additional Paid-In Capital 352,262 158,592   142,584    
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 303,370          
Retained Earnings (46,147) (32,187)   (40,431)    
Accumulated Other Comprehensive Loss (16,099) (42,100)   (44,039)    
Total Shareholders' Equity 301,147 95,436   69,230    
Total Liabilities and Shareholders' Equity 728,087 189,440   173,195    
Eliminations            
Current Assets:            
Cash and Cash Equivalents 0 0 $ 0 0 $ 0 $ 0
Restricted Cash 0 0   0    
Net Receivables 0 0   0    
Intercompany Receivables (204,639) (175,977)   (148,018)    
Inventories (10,458) (10,450)   (10,549)    
Prepaid Expenses 0 0   0    
Other Current Assets 0 0   0    
Assets Held for Sale       0    
Total Current Assets (215,097) (186,427)   (158,567)    
Property, Plant and Equipment 0 0   0    
Accumulated Depreciation 0 0   0    
Property, Plant and Equipment, Net 0 0   0    
Deferred Income Taxes 0 0   0    
Investment in Affiliates (385,331) (166,025)   (120,258)    
Intercompany Loans (307,090) (130,000)   (141,403)    
Goodwill 0 0   0    
Intangible Assets, Net 0 0   0    
Other Assets 0 0   0    
Total Assets (907,518) (482,452)   (420,228)    
Current Liabilities:            
Current Portion of Long-Term Debt 0 0   0    
Accounts Payable 0 0   0    
Intercompany Payables (204,639) (175,977)   (148,018)    
Employee Compensation and Benefits 0 0   0    
Income Taxes Payable 0 0   0    
Other Current Liabilities 0 0   0    
Liabilities Held for Sale       0    
Total Current Liabilities (204,639) (175,977)   (148,018)    
Long-Term Liabilities:            
Long-Term Debt 0 0   0    
Intercompany Loans (307,090) (130,000)   (141,403)    
Employee-Related Benefits 0 0   0    
Deferred Income Taxes 0 0   0    
Other Liabilities 0 0   0    
Total Long-Term Liabilities (307,090) (130,000)   (141,403)    
Total Liabilities (511,729) (305,977)   (289,421)    
Preferred Stock 0 0   0    
Common Stock (11,131) (11,131)   (11,116)    
Stockholders' Equity Attributable to Noncontrolling Interest (2,223)          
Additional Paid-In Capital (424,745) (231,075)   (211,497)    
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest (395,789)          
Retained Earnings 25,689 22,416   46,283    
Accumulated Other Comprehensive Loss 16,621 43,315   45,523    
Total Shareholders' Equity (393,566) (176,475)   (130,807)    
Total Liabilities and Shareholders' Equity $ (907,518) $ (482,452)   $ (420,228)