Summary of Significant Accounting Policies - Basic and Diluted Shares Outstanding (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Accounting Policies [Abstract]
Weighted average common stock outstanding-Basic (in shares)	21,942	21,597	21,844	21,448
Effect of dilutive options (in shares)	86	182	105	96
Weighted average common stock outstanding-Diluted (in shares)	22,028	21,779	21,949	21,544
Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Non-dilutive options (in shares)	0	0	0	172