Annual report pursuant to Section 13 and 15(d)

Share-Based Awards and Cash-Based Awards - Schedule of Restricted Stock Activity (Details)

v3.8.0.1
Share-Based Awards and Cash-Based Awards - Schedule of Restricted Stock Activity (Details) - Restricted Shares - $ / shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Nonvested, beginning of period 161,296 78,230 43,210
Granted 147,372 126,128 56,540
Vested (62,140) (43,062) (21,520)
Nonvested, end of period 246,528 161,296 78,230
Weighted Average Grant Date Value, Beginning of period $ 3.47 $ 8.95 $ 16.20
Weighted Average Grant Date Fair Value, Granted 1.90 2.22 6.19
Weighted Average Grant Date Fair Value, Vested 4.51 9.75 16.26
Weighted Average Grant Date Value, End of period $ 2.27 $ 3.47 $ 8.95