Related Party Transactions - Related Party Operating Expenses (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Related Party Transaction [Line Items]
General and Administrative—Related Party	$ 2,762	$ 2,581	$ 7,966	$ 8,193
Property lease expense [Member]
Related Party Transaction [Line Items]
General and Administrative—Related Party	1,168	1,144	3,556	3,553
Restricted stock compensation expense [Member]
Related Party Transaction [Line Items]
General and Administrative—Related Party	310	310	930	1,239
Aircraft operating and lease expense [Member]
Related Party Transaction [Line Items]
General and Administrative—Related Party	1,226	1,091	3,318	3,173
Salaries and wages, general & administrative and other expenses
Related Party Transaction [Line Items]
General and Administrative—Related Party	135	107	393	441
Reimbursement of certain general and administrative expenses
Related Party Transaction [Line Items]
General and Administrative—Related Party	$ (77)	$ (71)	$ (231)	$ (213)