Cash Flow Disclosures And Non Cash Investing And Financing Activities (Non-cash Investing And Financing Activities) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Non-cash Investing and Financing Activities [Abstract]
Common Shares issued as part of the Dividend Reinvestment Plan	$ 45	$ 31
Assets acquired through joint venture assignment and assumption	50,000
Debt assumed, including premium	44,483	14,750
Deposit paid in prior period towards acquisition which closed in current period		5,000
Cash paid for income taxes	653	669
Accrued payables for fixed assets placed into service	$ 1,477	467
Contribution of fixed assets to joint venture		$ 264,658