XML 184 R49.htm IDEA: XBRL DOCUMENT v3.8.0.1
Stockholder's Equity - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Subsidiary, Sale of Stock [Line Items]    
Allocated share-based compensation expense $ 0.6 $ 0.6
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized $ 5.6 $ 1.7
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition 2 years 8 months 16 days  
Share-based compensation arrangement by share-based payment award, equity instruments other than options, nonvested, number 200,000  
Restricted stock    
Subsidiary, Sale of Stock [Line Items]    
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period (in shares) 327,451 63,839