Commitments and Contingencies Line of Credit (Details)	Jun. 30, 2015 USD ($) debt_instrument	Dec. 31, 2014 USD ($)	Nov. 30, 2014 USD ($)
Debt Instrument [Line Items]
Line of credit borrowing capacity	$ 1,000,000
Restricted investments	1,401,000	$ 1,401,000
Line of Credit [Member]
Debt Instrument [Line Items]
Line of credit borrowing capacity			$ 5,000,000.0
Restricted investments			$ 6,300,000
Standby Letters of Credit [Member]
Debt Instrument [Line Items]
Line of credit borrowing capacity	113,000
Restricted investments	$ 1,400,000
Number of Letter of Credit | debt_instrument	1