Summary of Significant Accounting Policies - New Accounting Standards Adopted in 2016 (Details) - Accounting Standards Update 2015-03 $ in Thousands	Jun. 30, 2016 USD ($)
Senior Notes
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt issuance costs	$ 3,300
Repurchase Agreements
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt issuance costs	1,300
Securitized Debt
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt issuance costs	189
Other Noncurrent Assets [Member] | Senior Notes
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt issuance costs	(3,300)
Other Noncurrent Assets [Member] | Repurchase Agreements
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt issuance costs	(1,300)
Other Noncurrent Assets [Member] | Securitized Debt
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt issuance costs	$ (189)