Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Accounts receivable, allowances	$ 4,634				$ 5,139
Accumulated amortization on intangible assets	$ 11,440				$ 9,568
Preferred stock, par value (in dollars per shares)	$ 0.01	$ 0.01	$ 0.01	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000	5,000,000	5,000,000	5,000,000
Preferred stock, shares issued (in shares)	0	0	0	0	0
Preferred stock, shares outstanding (in shares)	0	0	0	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01	$ 0.01	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	60,000,000	60,000,000	60,000,000	60,000,000	60,000,000
Common stock, shares issued (in shares)	30,801,255				30,512,843
Common stock, shares outstanding (in shares)	30,801,255				30,512,843
Treasury stock, shares (in shares)	1,464,392	1,334,251	1,334,251	1,334,251	1,334,251