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Goodwill and Other Intangibles Investment in West Atlantic (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Payments to Acquire Interest in Joint Venture	$ 3,800	$ 2,500
Equity Method Investments	12,600		$ 12,500
Goodwill	395,974		$ 390,745
Investment in West Atlantic [Member]
Schedule of Equity Method Investments [Line Items]
Goodwill	$ 5,500
Redeemable Noncontrolling Interest, Equity, Preferred, Carrying Amount				$ 2,400