Subsequent Events Wells Fargo Credit Facility Amendment (Details)	3 Months Ended
Mar. 31, 2016
Subsequent Events [Abstract]
Subsequent Event, Description	In May 2016, the Company and Wells Fargo Bank, N.A. amended the committed repurchase facility to increase the aggregate maximum borrowing capacity to $350,000 and extend the maturity date to August 6, 2018.

Describes the event or transaction that occurred between the balance sheet date and the date the financial statements are issued or available to be issued.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 855
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6842918&loc=SL6314017-165662

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