Summary of Significant Accounting Policies New Accounting Pronouncements (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Right-of-Use Asset	$ 68,131	$ 0		$ 60,600
Operating Lease, Liability, Current	15,850	0		12,000
Operating Lease, Liability, Noncurrent	53,919	0		50,700
Goodwill, Impairment Loss	$ 25,784	$ 0	$ 0
Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption				$ 2,800