Commitments and Contingencies - Narrative (Details) - USD ($) $ in Millions |
Jun. 30, 2015 |
Dec. 31, 2014 |
|---|---|---|
| Line of Credit [Member] | Standby Letters of Credit [Member] | ||
| Loss Contingencies [Line Items] | ||
| Letters of Credit Outstanding, Amount | $ 1.5 | $ 1.5 |