CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Mar. 31, 2018	Dec. 31, 2017
Preferred stock, $0.01 par value, 5,000,000 shares authorized; none issued or outstanding
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, $0.01 par value, 50,000,000 shares authorized; 23,830,353 and 23,760,434 shares issued on March 31, 2018 and December 31, 2017, respectively
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	50,000,000	50,000,000
Common stock, shares issued (in shares)	23,830,353	23,760,434
Treasury stock, at cost, 9,716,412 and 9,702,874 shares on March 31, 2018 and December 31, 2017, respectively
Treasury stock, shares (in shares)	9,716,412	9,702,874