Summary of Significant Accounting Policies (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings per Share
Common stock equivalents (in shares)	473	209	398	294
Anti-dilutive common stock equivalents (in shares)	0	0	0	0