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Long-term Debt - Narrative (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018	Dec. 13, 2017	May 26, 2016	Sep. 22, 2006
Debt Instrument
Notes Payable, Noncurrent	$ 158,932,000	$ 160,118,000
BB&T Term Note Payable
Debt Instrument
Debt Instrument, Interest Rate, Effective Percentage	3.38%
Notes Payable, Noncurrent				$ 5,200,000
Debt Instrument, Interest Rate, Stated Percentage				1.65%
SBA Note Payable
Debt Instrument
Notes Payable, Noncurrent					$ 20,000,000
Debt Instrument, Interest Rate, Stated Percentage	1.69%
150M Senior Notes
Debt Instrument
Debt Instrument, Interest Rate, Effective Percentage	6.25%
Notes Payable, Noncurrent			$ 150,000,000