Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2014

Fair Value of Financial Instruments [Abstract]

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 December 31, 2014 and 2013, were as follows: 

	Fair Value Measurement at December 31, 2014 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	$	(7,094)	$	-	$	(7,094)	$	-
Fuel hedge derivative instrument –net liability position	$	(1,979)	$	-	$	-	$	(1,979)
Restricted assets	$	40,870	$	-	$	40,870	$	-

	Fair Value Measurement at December 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	$	(5,226)	$	-	$	(5,226)	$	-
Fuel hedge derivative instrument – net asset position	$	2,199	$	-	$	-	$	2,199
Restricted assets	$	32,782	$	-	$	32,782	$	-

Change in Fair Value for Level 3 Derivatives

The following table summarizes the change in the fair value for Level 3 derivatives for the years ended December 31, 2014 and 2013:

		Level 3 Derivatives
Balance as of December 31, 2012	$	1,187
Unrealized gains included in AOCL		1,012
Balance as of December 31, 2013		2,199
Realized gains included in earnings		(823)
Unrealized losses included in AOCL		(3,355)
Balance as of December 31, 2014	$	(1,979)