Quarterly report pursuant to Section 13 or 15(d)

Equity Incentive Plan Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity (Details)

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Equity Incentive Plan Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity (Details) - Second Restated 2009 Equity Incentive Plan [Member] - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Number of nonvested restricted common shares outstanding at beginning of period (in shares)     2,639,424 2,290,609
Weighted average grant date fair value of nonvested restricted common shares outstanding at beginning of period (in usd per share)     $ 8.55 $ 10.36
Number of restricted common shares granted during period under equity incentive plan (in shares)     1,343,689 1,759,737
Weighted average grant date fair value of restricted common shares granted during period under equity incentive plan (in usd per share)     $ 8.80 $ 7.38
Number of restricted common shares vested during period (in shares)     (1,290,649) (1,109,015)
Weighted average grant date fair value of restricted common shares vested during period (in usd per share)     $ (8.95) $ (10.33)
Number of restricted common shares forfeited during period (in shares)     (34,138) (41,175)
Weighted average grant date fair value of restricted common shares forfeited during period (in usd per share)     $ (9.02) $ (8.77)
Number of nonvested restricted common shares outstanding at end of period (in shares) 2,658,326 2,900,156 2,658,326 2,900,156
Weighted average grant date fair value of nonvested restricted common shares outstanding at end of period (in usd per share) $ 8.48 $ 8.59 $ 8.48 $ 8.59
Compensation costs related to restricted common stock $ 4,257 $ 4,904 $ 8,212 $ 7,755