Summary of Significant Accounting Policies - Net Income per Common Share (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accounting Policies [Abstract]
Anti-dilutive common stock equivalents related to options and restricted stock awards excluded from fully diluted calculation		766	784
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Weighted average common shares outstanding—basic	15,834	15,625	15,420
Dilutive common shares issuable in connection with stock plans	0	209	185
Weighted average common shares outstanding—diluted	15,834	15,834	15,605