Income Taxes (Narrative) (Details) - TRS Leasing, Inc [Member] $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Income Tax Disclosure [Line Items]
Current income tax expense (benefit)	$ 129
Combined federal and state effective tax rate	26.00%
Net operating loss carryforward for federal income tax purposes	$ 3,913
Minimum [Member]
Income Tax Disclosure [Line Items]
Loss carryforwards expiration period	Dec. 31, 2027
Maximum [Member]
Income Tax Disclosure [Line Items]
Loss carryforwards expiration period	Dec. 31, 2034