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Stockholders' Equity - Restricted Stock (Details) - Restricted stock awards
 6 Months Ended
Jun. 30, 2017
$ / shares
shares
Number of Awards  
Non-vested at the beginning of the period (in shares) 1,645,000
Granted (in shares) 1,798,000
Vested (in shares) (702,000)
Forfeited (in shares) (491,000)
Non-vested at the end of the period (in shares) 2,250,000
Weighted-Average Grant Date Fair Value  
Non-vested at the beginning of the period (in dollars per share) | $ / shares $ 36.27
Granted (in dollars per share) | $ / shares 21.45
Vested (in dollars per share) | $ / shares 32.34
Forfeited (in dollars per share) | $ / shares 28.15
Non-vested at the end of the period (in dollars per share) | $ / shares $ 27.43
2016 Performance Objectives  
Weighted-Average Grant Date Fair Value  
Restricted stock issued 43,413