Equity Narratives (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended	6 Months Ended
	Jul. 25, 2017	Jun. 30, 2017	Jun. 30, 2017	Jun. 30, 2016
Subsequent Event [Line Items]
Treasury Stock, Shares, Acquired			3,969,544
Treasury Stock, Value, Acquired, Par Value Method			$ 120,100
Treasury Stock Acquired, Average Cost Per Share			$ 30.25
Stock Repurchase Program, Remaining Authorized Repurchase Amount		$ 248,200	$ 248,200
Purchase of noncontrolling interest		$ 4,600	$ 4,580	$ 42
Business Acquisition, Percentage of Voting Interests Acquired		11.00%	11.00%
Subsequent Event [Member]
Subsequent Event [Line Items]
Treasury Stock, Shares, Acquired	103,599
Treasury Stock, Value, Acquired, Par Value Method	$ 3,500
Treasury Stock Acquired, Average Cost Per Share	$ 33.45
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 244,700