Related Party Transactions (Affiliated Notes Receivable) (Details) - Affiliated Entity - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Dec. 31, 2018
Related Party Transaction [Line Items]
Total notes receivable - affiliated	$ 128,479	$ 134,642
U.S. dollar floating rate notes
Related Party Transaction [Line Items]
Total notes receivable - affiliated	$ 0	6,502
U.S. dollar floating rate notes \| Minimum
Related Party Transaction [Line Items]
Interest Rates	4.02%
U.S. dollar floating rate notes \| Maximum
Related Party Transaction [Line Items]
Interest Rates	4.23%
U.S. Dollar fixed rate notes
Related Party Transaction [Line Items]
Total notes receivable - affiliated	$ 128,479	$ 128,140
U.S. Dollar fixed rate notes \| Minimum
Related Party Transaction [Line Items]
Interest Rates	0.00%
U.S. Dollar fixed rate notes \| Maximum
Related Party Transaction [Line Items]
Interest Rates	14.85%

For an unclassified balance sheet, amounts due from parties associated with the reporting entity as evidenced by a written promise to pay.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(k)(1))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.3)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Name:	us-gaap_NotesReceivableRelatedParties
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant