Selected Quarterly Financial Data - Receivable (Details)	12 Months Ended	0 Months Ended	3 Months Ended
Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Sep. 06, 2013 Barchester Loan USD ($)	Sep. 06, 2013 Barchester Loan GBP (£)	Sep. 30, 2013 Barchester Loan USD ($)	Sep. 30, 2013 Barchester Loan GBP (£)
Loans Receivable:
Cash payments received from borrower				$ 202,000,000	£ 129,000,000	$ 202,000,000	£ 129,000,000
Additional interest income as a result of extinguishment of loans	$ 74,491,000us-gaap_InterestIncomeOperating	$ 86,159,000us-gaap_InterestIncomeOperating	$ 24,536,000us-gaap_InterestIncomeOperating			$ 24,000,000

The cash inflow associated with the collection, including prepayments, of loans receivable issued for financing of goods and services.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

Name:	us-gaap_ProceedsFromCollectionOfLoansReceivable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration