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Equity Incentive Plans and Stock-Based Compensation (Details 2) - $ / shares
 1 Months Ended 3 Months Ended 12 Months Ended
Apr. 23, 2015
Apr. 24, 2014
Apr. 30, 2012
Apr. 30, 2009
Jun. 30, 2012
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Stock Compensation Plan [Member]                
Stock-Based Compensation                
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized   10,000,000   6,500,000 6,500,000   4,000,000 10,000,000
Shares available for grant                
Shares available, at the beginning of the year           11,173,545 10,724,228 2,527,428
Stock options granted (in shares)           (500,000) (362,335) (2,370,313)
Stock options forfeited (in shares)           1,081,107 1,624,823 1,400,349
Stock options expired under former plans (in shares)           (412,467) (657,878) (373,043)
Nonvested equity stock and stock units granted (in shares) [2]           (5,316,675) [1] (4,537,797) [3] (585,753)
Nonvested equity stock and stock units forfeited (in shares) [2]           1,279,858 382,504 125,560
Shares available, at the end of the period           7,305,368 11,173,545 10,724,228
Conversion factor used to calculate the decrease in the number of shares available for grant resulting from the grant of restricted stock awards           1.5 1.5 1.5
Conversion factor used to calculate the increase in the number of shares available for grant resulting from the forfeiture of restricted stock awards           1.5 1.5 1.5
Potential Additional Performance Stock Units [Domain]                
Shares available for grant                
Nonvested equity stock and stock units granted (in shares)           300,003 238,980  
Options                
Shares available for grant                
Stock options granted (in shares)           (500,000) (362,335) (2,370,313)
Stock options forfeited (in shares)           1,081,107 1,624,823 1,400,349
Options granted (in dollars per share)           $ 12.29 $ 11.27 $ 9.63
Expected weighted-average period for recognition of compensation cost (in years)           1 year 3 months 4 days    
Employee Stock [Member]                
Stock-Based Compensation                
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized 2,000,000 1,500,000 1,500,000          
Shares available for grant                
Shares available, at the end of the period           1,451,643    
Expected weighted-average period for recognition of compensation cost (in years)           4 months    
[1] Amount includes 300,003 shares that have been reserved for potential future issuance related to certain performance unit awards discussed under the section titled "Nonvested Equity Stock and Stock Units" below.
[2] For purposes of determining the number of shares available for grant under the 2015 Plan against the maximum number of shares authorized, each restricted stock granted reduces the number of shares available for grant by 1.5 shares and each restricted stock forfeited increases shares available for grant by 1.5 shares.
[3] Amount includes 238,980 shares that had been reserved for potential future issuance related to certain performance unit awards discussed under the section titled "Nonvested Equity Stock and Stock Units" below.