| **Other Assets (Tables)**                                                        | 6 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                          |
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| **Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
| Schedule of Other Assets                                                         | Other assets consist of the following: June 30, 2016 December 31, 2015Retained interest investments$10,429 $10,246Accounts receivable, net4,344 4,382Prepaid expenses6,277 5,849Straight line rent3,717 3,732Income tax receivable1,003 2,275Other assets6,759 6,751Accrued interest receivable for Senior Notes held by special purpose entity3,338 3,338Total other assets$35,867 $36,573 |

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| - References
No definition available.
+ Details**Name:**us-gaap_DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureAbstract**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
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| - Definition
Tabular disclosure of the carrying amounts of other assets. This disclosure includes other current assets and other noncurrent assets.
+ References
No definition available.
+ Details**Name:**us-gaap_ScheduleOfOtherAssetsTableTextBlock**Namespace Prefix:**us-gaap_**Data Type:**nonnum:textBlockItemType**Balance Type:**na**Period Type:**duration |