Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Supplemental Cash Flow Information [Abstract]
Interest paid, net of amounts capitalized	$ 5,876	$ 6,286	$ 7,443
Income tax paid, net of overpayment	932	1,703	29
Non-cash investing activities and financing activities:
Proceeds held in escrow through sale of real estate interests	0	912	0
Noncash Investing Activities Capital Expenditures for Real Estate in Accounts Payable	12	0	0
Capital expenditures for real estate in accrued liabilities	256	224	237
Accrued distributions payable	0	38,378	0
Accrued distributions to noncontrolling interest	$ 21	$ 52	$ 19