Subsequent Events Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended	3 Months Ended			6 Months Ended
	Jul. 15, 2019	Jul. 31, 2019	Jun. 30, 2019	Jul. 01, 2018	Apr. 01, 2018	Jun. 30, 2019	Jul. 01, 2018	Dec. 31, 2016
Subsequent Event [Line Items]
Shares repurchase program (in shares)			400,000	400,000		400,000	1,400,000
Value of shares repurchased			$ 22,815	$ 24,730	$ 75,270	$ 22,800	$ 100,000
Treasury stock acquired, average cost per share (in usd per share)			$ 57.47	$ 63.75		$ 57.47	$ 69.53
Subsequent Event
Subsequent Event [Line Items]
Shares repurchase program (in shares)		500,000
Value of shares repurchased		$ 27,200
Treasury stock acquired, average cost per share (in usd per share)		$ 55.17
Six Point Seven Five Percentage Series B Mandatory Convertible Preferred Stock
Subsequent Event [Line Items]
Percentage of issued shares								6.75%
Six Point Seven Five Percentage Series B Mandatory Convertible Preferred Stock | Subsequent Event
Subsequent Event [Line Items]
Preferred stock converted in to common stock (in shares)	132.50
Number of common stock issued upon conversion (in shares)	6,900,000