Summary of Significant Accounting Policies Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other	$ 42,603	$ 42,603	$ 33,607
Document Period End Date		Jun. 30, 2019
Impact From Change in Depreciable Lives	$ 4,100	$ 8,000
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Basic Earnings Per Share	$ 0.02	$ 0.04
Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other	$ 700	$ 700
Accounts Payable and Accrued Liabilities	2,700	2,700
Other Assets	62,600	62,600
Other Liabilities	53,200	53,200
Accrued Liabilities	$ 9,400	$ 9,400