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Summary of Significant Accounting Policies - Basic and Diluted Shares Outstanding (Details) - shares
shares in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Accounting Policies [Abstract]        
Weighted average common stock outstanding-Basic (in shares) 21,443 21,098 21,374 21,058
Effect of dilutive options (in shares) 73 45 52 82
Weighted average common stock outstanding-Diluted (in shares) 21,516 21,143 21,426 21,140
Options        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Non-dilutive options (in shares) 227 73 259 37