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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Statement of Financial Position [Abstract]    
Accounts receivable, allowance $ 1,665 $ 1,696
Contract assets, allowance 350 359
Property and equipment, accumulated depreciation 302,134 294,366
Intangible assets, accumulated amortization $ 15,045 $ 14,467
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 4,000,000 4,000,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 100,000,000 100,000,000
Common stock, shares issued (in shares) 16,817,256 16,734,239
Common stock, shares outstanding (in shares) 16,817,256 16,734,239