Commitments and Contingencies (Operating Lease Payments) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012 sqft
Operating Leased Assets [Line Items]
Aircraft hanger square feet	100,000
Cost of aircraft hanger	$ 15,700,000
Other Leases [Member]
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2013	25,208,000
2014	22,477,000
2015	12,583,000
2016	8,922,000
2017	4,869,000
2018 and beyond	4,264,000
Total minimum lease payments	78,323,000
Hanger Lease [Member]
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2013	0
2014	592,000
2015	602,000
2016	832,000
2017	834,000
2018 and beyond	15,443,000
Total minimum lease payments	$ 18,303,000
Boeing 767 Aircraft [Member]
Operating Leased Assets [Line Items]
Number of leased aircrafts	6
Minimum [Member]
Operating Leased Assets [Line Items]
Construction of aircraft hanger period	12 months
Maximum [Member]
Operating Leased Assets [Line Items]
Construction of aircraft hanger period	14 months