Fair Value Measurements (Assets and Liabilities Measured on Recurring Basis) (Details) - USD ($) $ / shares in Units, $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Level 1
Liabilities:
Money market funds, stable net asset value per share (in dollars per share)	$ 1.00
Recurring
Assets:
Investment in equity securities	$ 3,683	$ 6,100
Total	12,487	12,137
Liabilities:
Financing derivatives: no hedging designation	22,000	26,100
Recurring \| No hedge designation \| Interest rate reset
Liabilities:
Financing derivatives: no hedging designation	18,500	23,300
Recurring \| No hedge designation \| Change of control redemption
Liabilities:
Financing derivatives: no hedging designation	3,500	2,800
Recurring \| Money market funds
Assets:
Money market funds	8,804	6,037
Recurring \| Level 1
Assets:
Investment in equity securities	3,683	6,100
Total	12,487	12,137
Liabilities:
Financing derivatives: no hedging designation	0	0
Recurring \| Level 1 \| No hedge designation \| Interest rate reset
Liabilities:
Financing derivatives: no hedging designation	0	0
Recurring \| Level 1 \| No hedge designation \| Change of control redemption
Liabilities:
Financing derivatives: no hedging designation	0	0
Recurring \| Level 1 \| Money market funds
Assets:
Money market funds	8,804	6,037
Recurring \| Level 2
Assets:
Investment in equity securities	0	0
Total	0	0
Liabilities:
Financing derivatives: no hedging designation	0	0
Recurring \| Level 2 \| No hedge designation \| Interest rate reset
Liabilities:
Financing derivatives: no hedging designation	0	0
Recurring \| Level 2 \| No hedge designation \| Change of control redemption
Liabilities:
Financing derivatives: no hedging designation	0	0
Recurring \| Level 2 \| Money market funds
Assets:
Money market funds	0	0
Recurring \| Level 3
Assets:
Investment in equity securities	0	0
Total	0	0
Liabilities:
Financing derivatives: no hedging designation	22,000	26,100
Recurring \| Level 3 \| No hedge designation \| Interest rate reset
Liabilities:
Financing derivatives: no hedging designation	18,500	23,300
Recurring \| Level 3 \| No hedge designation \| Change of control redemption
Liabilities:
Financing derivatives: no hedging designation	3,500	2,800
Recurring \| Level 3 \| Money market funds
Assets:
Money market funds	$ 0	$ 0

Fair Value, Investments, Net Asset Value Per Share Amount

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (c)
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
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- Definition

Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740

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