Long-Term Debt and Credit Facility - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Other notes with interest rates from 3.3% to 6.5%	$ 9,852	$ 9,797
Subtotal	385,102	355,422
Less – Current maturities and notes payable	17,649	17,648
Less – Unamortized loan costs	4,072	4,294
Total	363,381	333,480
Term Note
Debt Instrument [Line Items]
Term note, due October 30, 2020, annualized rates of 2.63% and 2.61%, respectively	$ 341,250	$ 345,625
Current annualized interest rate	2.63%	2.61%
Line of Credit
Debt Instrument [Line Items]
Line of credit, 2.44%	$ 34,000	$ 0
Current annualized interest rate	2.40%	2.40%
Other notes | Minimum
Debt Instrument [Line Items]
Current annualized interest rate	3.30%	3.30%
Other notes | Maximum
Debt Instrument [Line Items]
Current annualized interest rate	6.50%	6.50%