Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2013

Assets and Liabilities Measured At Fair Value on Recurring Basis

The Company’s assets and liabilities measured at fair value on a recurring basis at March 31, 2013 and December 31, 2012, were as follows:

	Fair Value Measurement at March 31, 2013 Using
	Total			Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
Interest rate swap derivative instruments – net liability position	$	(9,823	)	$	—	$	(9,823	)	$	—
Fuel hedge derivative instrument – net asset position	$	1,778		$	—	$	—		$	1,778
Restricted assets	$	33,739		$	33,739	$	—		$	—

	Fair Value Measurement at December 31, 2012 Using
	Total			Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
Interest rate swap derivative instruments – net liability position	$	(11,163	)	$	—	$	(11,163	)	$	—
Fuel hedge derivative instrument – net asset position	$	1,187		$	—	$	—		$	1,187
Restricted assets	$	33,425		$	33,425	$	—		$	—

Change in Fair Value for Level 3 Derivatives

The following table summarizes the change in the fair value for Level 3 derivatives for the three months ended March 31, 2013:

	Level 3 Derivatives
Balance as of December 31, 2012	$	1,187
Unrealized gains included in AOCL		591
Balance as of March 31, 2013	$	1,778

The following table summarizes the change in the fair value for Level 3 derivatives for the three months ended March 31, 2012:

	Level 3 Derivatives
Balance as of December 31, 2011	$	3,506
Realized gains included in earnings		(1,129	)
Unrealized gains included in AOCL		1,473
Balance as of March 31, 2012	$	3,850