| Schedule of Related Party Transactions, by Related Party (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
| Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | |
| Related Party Transaction [Line Items] | ||||
| Asset Management Costs | $ 11,837 | $ 12,686 | $ 23,881 | $ 25,407 | 
| Management Fee, Percent | 1.50% | |||
| Costs and Expenses, Related Party | 6,033 | 5,359 | $ 12,827 | 10,130 | 
| Allocated Share-based Compensation Expense | $ 4,904 | $ 2,930 | $ 7,755 | $ 5,619 | 
| X | ||||||||||
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- Definition Percent per annum of stockholders' equity used to calculate the management fee due to PRCM Advisers. No definition available. 
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition The aggregate costs related to asset management during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Costs of sales and operating expenses for the period incurred from transactions with related parties. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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| X | ||||||||||
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available. 
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