Derivative Instruments (Tables)

12 Months Ended

Dec. 31, 2012

Schedule of fair value of derivatives by contract type

	Derivatives
		Fair Value
		Years Ended December 31,
Derivatives Designated as Hedging Instruments	Balance Sheet Location	2012		2011
		(in thousands)
Interest rate contracts	Liabilities under derivative instruments	$	1,690	$	12,341

Schedule of income effects of cash flow hedging relationships

		Amount of Loss (Gain) Recognized on Derivatives in the Statements of Income
Derivatives in Cash Flow Hedging	Location of Loss (Gain) Recognized on	Years Ended December 31,
Relationships	Derivatives in the Statements of Income	2012		2011		2010
		(in thousands)
Interest rate contracts	Interest expense	$	6,427	$	11,349	$	18,633
Reclassification adjustment for losses included in termination of derivative instruments	Loss on debt extinguishment and derivative termination	$	10,143	$	—	$	—
Total		$	16,570	$	11,349	$	18,633

Schedule of information about financial statement effects related to cash flow hedges

Derivatives in Cash Flow Hedging Relationships	Amount of Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)							Location of Loss (Gain) Reclassified from Accumulated OCI into Income	Amount of Loss (Gain) Reclassified from Accumulated OCI into Income (Effective Portion)
	Years Ended December 31,								Years Ended December 31,
	2012		2011		2010			(Effective Portion)	2012		2011		2010
	(in thousands)								(in thousands)
Interest rate contracts*	$	508	$	1,933	$	(6,380	)	Interest expense	$	6,427	$	11,349	$	18,633
Total	$	508	$	1,933	$	(6,380	)	Total	$	6,427	$	11,349	$	18,633

* These amounts are shown net of $6.7 million, $10.9 million and $15.7 million of interest payments reclassified to the income statement during the years ended December 31, 2012, 2011 and 2010, respectively.

- Definition

Tabular disclosure of the location and amount of gains and losses reported in the statement of financial performance, or when applicable, the statement of financial position. For example, (a) gains and losses recognized in the income statement on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges and (b) gains and losses initially recognized in other comprehensive income on derivative instruments designated and qualifying as cash flow hedges.

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- Definition

Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position.

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