Goodwill and Other Intangibles Investment in West Atlantic (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]
Payments to Acquire Interest in Joint Venture	$ 11,400	$ 8,700
Equity Method Investments	12,500	12,700
Goodwill	390,745	37,279	$ 37,133
Investment in West Atlantic [Member]
Schedule of Equity Method Investments [Line Items]
Goodwill	$ 5,500
Redeemable Noncontrolling Interest, Equity, Preferred, Carrying Amount		$ 2,400