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Stockholders' Equity - Dividends (Details) - $ / shares
3 Months Ended 12 Months Ended
Oct. 24, 2018
Jul. 24, 2018
Apr. 25, 2018
Jan. 24, 2018
Oct. 25, 2017
Jul. 25, 2017
Apr. 25, 2017
Jan. 25, 2017
Oct. 26, 2016
Jul. 20, 2016
Apr. 20, 2016
Jan. 27, 2016
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Subsequent Event [Line Items]                                              
Declared Oct. 24, 2018 Jul. 24, 2018 Apr. 25, 2018 Jan. 24, 2018 Oct. 25, 2017 Jul. 25, 2017 Apr. 25, 2017 Jan. 25, 2017 Oct. 26, 2016 Jul. 20, 2016 Apr. 20, 2016 Jan. 27, 2016                      
Cash Dividend per Share (in usd per share) $ 0.17 $ 0.15 $ 0.15 $ 0.15 $ 0.13 $ 0.13 $ 0.13 $ 0.12 $ 0.12 $ 0.12 $ 0.12 $ 0.11 $ 0.27 $ 0.15 $ 0.15 $ 0.15 $ 0.23 $ 0.13 $ 0.13 $ 0.12 $ 0.72 $ 0.61 $ 0.72
Record Date Nov. 07, 2018 Aug. 09, 2018 May 10, 2018 Feb. 07, 2018 Nov. 08, 2017 Aug. 10, 2017 May 10, 2017 Feb. 09, 2017 Nov. 08, 2016 Aug. 04, 2016 May 05, 2016 Feb. 10, 2016                      
Paid Date Nov. 21, 2018 Aug. 23, 2018 May 24, 2018 Feb. 21, 2018 Nov. 22, 2017 Aug. 24, 2017 May 24, 2017 Feb. 23, 2017 Nov. 22, 2016 Aug. 18, 2016 May 19, 2016 Feb. 24, 2016                      
Special Dividend                                              
Subsequent Event [Line Items]                                              
Declared Oct. 24, 2018       Oct. 25, 2017       Oct. 26, 2016                            
Cash Dividend per Share (in usd per share) $ 0.10       $ 0.10       $ 0.25                            
Record Date Nov. 07, 2018       Nov. 08, 2017       Nov. 08, 2016                            
Paid Date Nov. 21, 2018       Nov. 22, 2017       Nov. 22, 2016