Long-Term Debt and Credit Facility - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Subtotal	$ 379,631	$ 374,026
Less – Current maturities of long-term debt	22,020	19,835
Less – Unamortized loan costs	3,184	3,406
Total	354,427	350,785
Term Note
Debt Instrument [Line Items]
Term note, due October 30, 2020, annualized rates of 3.27% and 3.08%, respectively	$ 323,750	328,125
Current effective interest rate	3.27%
Line of Credit
Debt Instrument [Line Items]
Line of credit, 3.18% and 2.96%, respectively	$ 46,000	36,000
Current effective interest rate	3.18%
Other notes
Debt Instrument [Line Items]
Other notes with interest rates from 3.3% to 6.5%	$ 9,881	$ 9,901
Other notes | Minimum
Debt Instrument [Line Items]
Current annualized interest rate	3.30%
Other notes | Maximum
Debt Instrument [Line Items]
Current annualized interest rate	6.50%