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Debt Part 1 (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Apr. 04, 2017
Dec. 31, 2015
Debt Instrument        
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year $ 1,348      
Total Debt 395,671 $ 36,194   $ 24,653
Debt Instrument, Unamortized Debt Issuance Costs, Noncurrent, net (7,138) 0    
Less: current portion (5,281) (3,459)   (3,459)
Capital Lease Obligations, Current (394) 0    
Long-Term Debt 383,252 32,735   21,194
Committed lines of credit   125,000    
Uncommitted lines of credit   85,000    
Letters of credit, Outstanding amount 4,721 3,774    
Commitment fees on unused lines of credit 353 $ 222    
Indebtedness to EBITDA ratio   0.49 to 1    
EBITDA to interest expense ratio   70.20 to 1    
Aggregate maturities of outstanding debt including capital lease obligations        
2017   $ 3,459    
2018 5,386 3,449    
2019 7,062 1,429    
2020 9,375 26,428    
2021 11,875 1,429    
Thereafter 360,625 0    
Total aggregate maturities 395,671 36,194    
JP Morgan, Amended and Restated Credit Agreement [Member]        
Debt Instrument        
Total Debt   36,143    
Outstanding Borrowings   $ 25,000 $ 45,000  
Aggregate maturities of outstanding debt including capital lease obligations        
Minimum interest rate spread added to adjusted LIBOR rate based on leverage ratio on Eurocurrency borrowings (in hundreths)   1.075%    
Additional borrowing capacity available   $ 62,500    
JPMorgan, 2017 Credit Agreement [Member]        
Debt Instrument        
Total Debt 95,000      
Prudential Investment Management, Inc. Private Shelf Agreement        
Debt Instrument        
Outstanding Borrowings   11,143    
Credit facility borrowings, Long-Term        
Debt Instrument        
Total Debt   36,143   24,571
Debt, Current, Net of Debt Issuance Costs (4,887) (3,459)    
Less: current portion (5,000)      
Outstanding Borrowings $ 75,000      
Credit facility borrowings, Long-Term | JPMorgan, 2017 Credit Agreement [Member]        
Aggregate maturities of outstanding debt including capital lease obligations        
Minimum interest rate spread added to adjusted LIBOR rate based on leverage ratio on Eurocurrency borrowings (in hundreths) 1.25%      
Capital lease obligations        
Debt Instrument        
Total Debt $ 671 51   $ 82
Revolving Credit Facility [Member]        
Debt Instrument        
Outstanding Borrowings $ 20,000      
Revolving Credit Facility [Member] | JPMorgan, 2017 Credit Agreement [Member]        
Aggregate maturities of outstanding debt including capital lease obligations        
Minimum interest rate spread added to adjusted LIBOR rate based on leverage ratio on Eurocurrency borrowings (in hundreths) 1.075%      
Additional borrowing capacity available $ 150,000      
Bonds        
Debt Instrument        
Total Debt $ 300,000 $ 0