Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Summary of nonvested restricted stock award activity) (Details)

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Stockholders' Equity (Summary of nonvested restricted stock award activity) (Details) - Restricted Stock [Member] - Stock Option Plan Member [Member] - $ / shares
shares in Thousands
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Shares (in thousands)    
Nonvested beginning balance (shares) 1,495  
Granted (shares) 580  
Vested (shares) (272)  
Forfeited (shares) (2)  
Nonvested ending balance (shares) 1,801  
Weighted Average Grant Date Fair Value    
Nonvested, Beginning (USD per share) $ 11.08  
Granted (USD per share) 17.68 $ 14.70
Vested (USD per share) 10.39  
Forfeited (USD per share) 15.39  
Nonvested, Ending (USD per share) $ 13.30