Commitments and Contingencies (Operating Lease Payments) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
Jun. 30, 2014 sqft
Operating Leased Assets [Line Items]
Aircraft hanger square feet	100,000
Cost of aircraft hanger	$ 15.7
Boeing 767 Aircraft [Member]
Operating Leased Assets [Line Items]
Number of leased aircrafts	6

The number of units (items of property) under operating lease arrangements.

No definition available.

Name:	us-gaap_PropertySubjectToOrAvailableForOperatingLeaseNumberOfUnits
Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant