Leases (Details) (USD $)	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Future minimum lease payments under capital leases [Abstract]
2014	$ 34,684,000
2015	32,339,000
2016	29,214,000
2017	24,688,000
2018	18,540,000
Thereafter	39,850,000
Total minimum lease payments	179,315,000
Less amounts representing interest	(18,950,000)
Present value of minimum capital lease payments	160,365,000
Less current installments	(29,116,000)	(39,343,000)
Noncurrent obligations under capital leases	131,249,000	200,337,000
Future minimum lease payments under operating leases [Abstract]
2014	8,038,000
2015	5,839,000
2016	3,868,000
2017	2,520,000
2018	1,589,000
Thereafter	23,727,000
Total minimum lease payments	45,581,000
Rent expense relating to operating leases [Abstract]
Rent expense relating to operating leases	14,385,000	13,732,000	9,177,000
Unamortized completion allowances	11,140,000	19,110,000
Property held under capital leases [Abstract]
Property held under capital leases, net of accumulated depreciation	$ 145,620,000	$ 217,213,000

The amount of unamortized completion allowances included in other liabilities as of the balance sheet date. These represent certain allowances received by the company for the completion of medical interiors within its leased aircraft. Gains associated with these completion allowances are deferred and amortized over the term of the lease.

No definition available.