Commitments and Contingencies (Narrative) (Details) $ in Thousands	6 Months Ended
Jun. 30, 2016 USD ($) state	Dec. 31, 2015 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Letters of credit outstanding \| $	$ 12,491	$ 19,809
Number of states participating in examination \| state	44

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

No definition available.

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant