Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies (Share Repurchases) (Details)

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Summary of Significant Accounting Policies (Share Repurchases) (Details) - USD ($)
shares in Thousands
3 Months Ended 6 Months Ended
Jun. 02, 2016
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Equity, Class of Treasury Stock [Line Items]          
Repurchases of shares of common stock (in shares)     1,296,243   1,937,844
Repurchases of shares of common stock     $ 17,220,000   $ 25,048,000
December 2017 Program          
Equity, Class of Treasury Stock [Line Items]          
Repurchases of shares of common stock     17,220,000   25,048,000
June 2018 Program          
Equity, Class of Treasury Stock [Line Items]          
Repurchases of shares of common stock     0   0
Convertible Notes | 2019 Senior Convertible Notes Repurchases          
Equity, Class of Treasury Stock [Line Items]          
Convertible Notes Repurchases, Principal amount     0   6,311,000
Convertible Notes Repurchases     0   6,689,000
Convertible Notes | 2019 Senior Convertible Notes Repurchases | December 2017 Program          
Equity, Class of Treasury Stock [Line Items]          
Convertible Notes Repurchases     0   6,689,000
Convertible Notes | 2019 Senior Convertible Notes Repurchases | June 2018 Program          
Equity, Class of Treasury Stock [Line Items]          
Convertible Notes Repurchases     0   0
Convertible Notes | 2036 Senior Convertible Notes Repurchases          
Equity, Class of Treasury Stock [Line Items]          
Convertible Notes Repurchases, Principal amount     24,500,000   24,500,000
Convertible Notes Repurchases $ 147,118,000 $ 0 41,763,000 $ 0 41,763,000
Convertible Notes | 2036 Senior Convertible Notes Repurchases | December 2017 Program          
Equity, Class of Treasury Stock [Line Items]          
Convertible Notes Repurchases     41,763,000   41,763,000
Convertible Notes | 2036 Senior Convertible Notes Repurchases | June 2018 Program          
Equity, Class of Treasury Stock [Line Items]          
Convertible Notes Repurchases     $ 0   $ 0