Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Summary of Nonvested Restricted Stock Award Activity) (Details)

v3.7.0.1
Stockholders' Equity (Summary of Nonvested Restricted Stock Award Activity) (Details) - Restricted Stock [Member] - Stock Option Plan Member [Member] - $ / shares
shares in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Shares (in thousands)    
Nonvested beginning balance (shares) 1,465  
Granted (shares) 522  
Vested (shares) (279)  
Nonvested ending balance (shares) 1,708  
Weighted Average Grant Date Fair Value    
Nonvested, Beginning (USD per share) $ 14.41  
Granted (USD per share) 20.83 $ 18.16
Vested (USD per share) 11.89  
Nonvested, Ending (USD per share) $ 16.79