Quarterly report pursuant to Section 13 or 15(d)

Stock-based Expense (Details)

v3.5.0.2
Stock-based Expense (Details) - $ / shares
1 Months Ended 3 Months Ended 6 Months Ended
Mar. 31, 2015
Jun. 30, 2016
Jun. 30, 2016
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares issued to non-employees as payment for consulting services   21,400  
Performance-Based Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted shares of restricted stock     729,300
Performance-Based Restricted Stock | Vesting condition 1      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted shares of restricted stock   0 364,651
Number of consecutive trading days required to calculate average price per share (in days)     20 days
Minimum price per common stock for vesting eligibility (in dollars per share)     $ 27.28
Performance-Based Restricted Stock | Vesting condition 2      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted shares of restricted stock   0 364,649
Number of consecutive trading days required to calculate average price per share (in days)     20 days
Minimum price per common stock for vesting eligibility (in dollars per share)     $ 32.15
2010 Equity Incentive Plan | Restricted Stock | Vesting condition 1      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted shares of restricted stock   306,055 1,565,127
Vesting period (in years)     3 years
2010 Equity Incentive Plan | Restricted Stock | Vesting condition 2      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted shares of restricted stock   55,783 55,783
Vesting period (in years)     1 year
2010 Equity Incentive Plan | Performance-Based Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period (in years) 1 year