Obligations Under Investment Agreements Obligations Under Investment Agreements - Principal Due Under Investment Agreements (Details) $ in Thousands	Dec. 31, 2015 USD ($)
Investment [Line Items]
Investment Agreement Expected Repayments of Principal	$ 100,358
2016 [Member]
Investment [Line Items]
Investment Agreement Expected Repayments of Principal	0
2017 [Member]
Investment [Line Items]
Investment Agreement Expected Repayments of Principal	100,358
2018 [Member]
Investment [Line Items]
Investment Agreement Expected Repayments of Principal	0
2019 [Member]
Investment [Line Items]
Investment Agreement Expected Repayments of Principal	0
2020 [Member] [Member]
Investment [Line Items]
Investment Agreement Expected Repayments of Principal	0
All Later Years [Member]
Investment [Line Items]
Investment Agreement Expected Repayments of Principal	$ 0