Discontinued Operations (Narrative) (Details) - USD ($) $ in Thousands		9 Months Ended	12 Months Ended
	Jan. 03, 2017	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment of assets				$ 0
Cash provided by operating activities of discontinued operations				4,477	$ 4,733	$ 3,517
Cash used in investing activities related to discontinued operations				$ 1,139	$ 2,385	$ 9,551
Term of lease				10 years
Early termination term				5 years
Subsequent Event [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale	$ 67,000
Subsequent Event [Member] | Scenario, Forecast [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale		$ 4,000
Subsequent Event [Member] | Discontinued Operations Held-for-sale [Member] | Scenario, Forecast [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total annual lease payments			$ 1,288