Fair Value Measurements - Notes (Details) - Notes $ in Thousands	Mar. 31, 2016 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
2033 Senior Notes	$ 25,737
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
2033 Senior Notes	25,737
Carrying Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
2033 Senior Notes	$ 26,122