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Debt (Details 3) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Apr. 18, 2017
Apr. 04, 2017
Dec. 31, 2015
Debt Instrument          
Line of Credit Facility, Covenant Terms The 2017 Credit Agreement contains customary representations, warranties and covenants, including, but not limited to, covenants restricting the company’s ability to incur indebtedness and liens and merge or consolidate with another entity. The 2017 Credit Agreement also contains financial covenants, requiring us to maintain a ratio of consolidated total indebtedness to consolidated earnings before income, taxes, depreciation and amortization, subject to certain adjustments ("Adjusted EBITDA") of not greater than 4.25 to 1, as well as requiring us to maintain a ratio of consolidated Adjusted EBITDA to consolidated interest expense of no less than 3.50 to 1 for the quarter ended September 30, 2017. The 2017 Credit Agreement also contains a financial covenant requiring us to maintain a senior secured net indebtedness to Adjusted EBITDA ratio of not greater than 3.50 to 1. These financial covenants may restrict our ability to pay dividends and purchase outstanding shares of our common stock. We were in compliance with our financial covenants at September 30, 2017. We will be required to repay the senior credit agreement with 25% to 50% of our excess cash flow from the preceding fiscal year, as defined in the agreement, unless our net leverage ratio for such preceding fiscal year is less than or equal to 3.00 to 1, which will be first measured using our fiscal year ended December 31, 2018.        
Registration Rights Agreement, Effective Date Apr. 18, 2017        
Registration Rights Agreement Term 360 days        
Long-term Debt          
Total Debt $ 395,671 $ 36,194     $ 24,653
Less: Unamortized Debt Issuance Costs (7,138) 0      
Less: Current Maturities of Capital Lease Obligations (394) 0      
Long-Term Portion 383,252 32,735     21,194
Current Portion of Long-Term Debt 5,281 3,459     3,459
Letters of Credit Outstanding 4,721 3,774      
Commitment fees on unused line of credit $ 353 222      
Weighted average interest rate 5.00%        
Debt, Weighted Average Interest Rate, net of Currency Swap Contract 4.20%        
Aggregate maturities of outstanding debt including capital lease obligations          
Remaining 2017 $ 1,348        
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      
Bonds          
Debt Instrument          
Debt Instrument, Interest Rate, Stated Percentage 5.625%   5.625%    
Bonds, Initiation Date Apr. 18, 2017        
Face amount     $ 300,000    
Debt Instrument, Maturity Date May 01, 2025        
Long-term Debt          
Total Debt $ 300,000 0      
Term Loan Facility          
Debt Instrument          
Outstanding Borrowings 75,000        
Long-term Debt          
Total Debt   36,143     24,571
Less: Current Maturities of Credit Facility Borrowings, Net of Debt Issuance Costs (4,887) (3,459)      
Current Portion of Long-Term Debt 5,000        
Unamortized Debt Issuance Costs, Current Portion 113        
Revolving Facility          
Debt Instrument          
Outstanding Borrowings 20,000        
Capital lease obligations          
Long-term Debt          
Total Debt $ 671 $ 51     $ 82
JPMorgan, 2017 Credit Agreement          
Debt Instrument          
Line of Credit Facility, Initiation Date Apr. 04, 2017        
Line of Credit Facility, Expiration Date Apr. 04, 2022        
Line Of Credit Facility, Interest rate margin spread added to Federal Funds Rate on US Dollar borrowings 0.50%        
Line Of Credit Facility, Minimum LIBOR one month interest rate on borrowings denominated in US dollars 0.00%        
Line Of Credit Facility, Interest rate margin spread added to LIBOR rate on US Dollar borrowings 1.00%        
Line Of Credit Facility, Minimum LIBOR one month interest rate on eurocurrency borrowings 0.00%        
Long-term Debt          
Total Debt $ 95,000        
JPMorgan, 2017 Credit Agreement | Term Loan Facility          
Debt Instrument          
Line of Credit Facility, Current Borrowing Capacity $ 400,000        
Line Of Credit Facility, Minimum interest rate margin spread added to LIBOR rate on US Dollar borrowings 0.25%        
Line Of Credit Facility, Maximum interest rate margin spread added to LIBOR rate on US Dollar borrowings 1.25%        
Minimum interest rate spread added to adjusted LIBOR rate based on leverage ratio on Eurocurrency borrowings (in hundreths) 1.25%        
Maximum interest rate spread added to adjusted LIBOR rate based on leverage ratio on Eurocurrency borrowings (in hundreths) 2.25%        
Face amount     $ 300,000    
JPMorgan, 2017 Credit Agreement | Revolving Facility          
Debt Instrument          
Line of Credit Facility, Current Borrowing Capacity $ 200,000        
Line Of Credit Facility, Additional Borrowing Capacity Available $ 150,000        
Line Of Credit Facility, Minimum commitment fee percentage 0.175%        
Line Of Credit Facility, Maximum commitment fee percentage 0.35%        
Line Of Credit Facility, Minimum interest rate margin spread added to LIBOR rate on US Dollar borrowings 0.075%        
Line Of Credit Facility, Maximum interest rate margin spread added to LIBOR rate on US Dollar borrowings 0.90%        
Minimum interest rate spread added to adjusted LIBOR rate based on leverage ratio on Eurocurrency borrowings (in hundreths) 1.075%        
Maximum interest rate spread added to adjusted LIBOR rate based on leverage ratio on Eurocurrency borrowings (in hundreths) 1.90%        
JPMorgan, Previous Credit Agreement          
Debt Instrument          
Line of Credit Facility, Expiration Date   Jun. 30, 2020      
Line of Credit Facility, Current Borrowing Capacity   $ 125,000      
Line Of Credit Facility, Additional Borrowing Capacity Available   $ 62,500      
Line Of Credit Facility, Minimum commitment fee percentage   0.175%      
Line Of Credit Facility, Maximum commitment fee percentage   0.30%      
Minimum interest rate spread added to adjusted LIBOR rate based on leverage ratio on Eurocurrency borrowings (in hundreths)   1.075%      
Maximum interest rate spread added to adjusted LIBOR rate based on leverage ratio on Eurocurrency borrowings (in hundreths)   1.70%      
Outstanding Borrowings   $ 25,000   $ 45,000  
Long-term Debt          
Total Debt   $ 36,143      
Weighted average interest rate   1.64%      
Prudential Investment Management, Inc.          
Debt Instrument          
Outstanding Borrowings   $ 11,143      
Long-term Debt          
Repayments of Long-term Debt $ 11,143