Acquisitions and Strategic Transaction Expenses (Details) - USD ($) $ in Thousands, shares in Millions	2 Months Ended	12 Months Ended
	Mar. 01, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Business Combination, Consideration Transferred			$ 56,786
Bargain Purchase Gain		$ 1,456	0	$ 0
Strategic Transaction Costs		14,300	$ 1,800	$ 1,600
Tangent [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred		$ 2,600
Subsequent Event [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred	$ 275,000
Proceeds from Issuance of Unsecured Debt	$ 75,000
Stock Issued During Period, Shares, Acquisitions	3.2
Business Combination, Contingent Consideration, Liability	$ 225,000