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Share and Unit-Based Plans: (Tables)

12 Months Ended

Dec. 31, 2011

Share and Unit-Based Plans:

Summary of activity of non-vested stock awards

		2011						2010						2009
		Shares			Weighted Average Grant Date Fair Value			Shares			Weighted Average Grant Date Fair Value			Shares			Weighted Average Grant Date Fair Value
Balance at beginning of year			63,351		$	53.69			126,137		$	69.53			275,181		$	74.68
Granted			11,350			48.47			11,664			38.58			6,500			8.21
Vested			(53,571	)		57.36			(74,143	)		78.48			(155,077	)		76.09
Forfeited			—			—			(307	)		61.17			(467	)		70.19
Balance at end of year			21,130		$	40.68			63,351		$	53.69			126,137		$	69.53

Summary of activity of non-vested stock units

		2011						2010						2009
		Units			Weighted Average Grant Date Fair Value			Units			Weighted Average Grant Date Fair Value			Units			Weighted Average Grant Date Fair Value
Balance at beginning of year			1,038,549		$	7.17			1,567,597		$	7.17			—		$	—
Granted			64,463			48.36			—			—			1,600,002			7.17
Vested			(519,272	)		7.17			(529,048	)		7.17			(32,405	)		7.17
Forfeited			(7,400	)		12.35			—			—			—			—
Balance at end of year			576,340		$	11.71			1,038,549		$	7.17			1,567,597		$	7.17

Summary of activity of SARs awards

		2011						2010						2009
		Units			Weighted Average Exercise Price			Units			Weighted Average Exercise Price			Units			Weighted Average Exercise Price
Balance at beginning of year			1,242,314		$	56.56			1,324,700		$	56.56			1,326,792		$	56.63
Granted			—			—			—			—			31,323		$	53.72
Exercised			—			—			—			—			—			—
Forfeited			(85,329	)	$	56.63			(82,386	)	$	56.63			(33,415	)	$	56.63
Balance at end of year			1,156,985		$	56.55			1,242,314		$	56.56			1,324,700		$	56.56

Summary of activity of non-vested LTIP Units

		2011						2010						2009
		Units			Weighted Average Grant Date Fair Value			Units			Weighted Average Grant Date Fair Value			Units			Weighted Average Grant Date Fair Value
Balance at beginning of year			272,226		$	50.68			252,940		$	55.50			299,350		$	57.02
Granted			422,631			46.48			232,632			48.89			—			—
Vested			(504,857	)		49.85			(213,346	)		54.45			(46,410	)		65.29
Forfeited			—			—			—			—			—			—
Balance at end of year			190,000		$	43.30			272,226		$	50.68			252,940		$	55.50

Summary of activity of stock options

		2011						2010						2009
		Options			Weighted Average Exercise Price			Options			Weighted Average Exercise Price			Options			Weighted Average Exercise Price
Balance at beginning of year			110,711		$	75.08			110,711		$	75.08			110,711		$	75.08
Granted			—			—			—			—			—			—
Exercised			—			—			—			—			—			—
Forfeited			(108,011	)	$	76.05			—			—			—			—
Balance at end of year			2,700		$	36.51			110,711		$	75.08			110,711		$	75.08

Summary of activity of non-vested phantom stock units

		2011						2010						2009
		Units			Weighted Average Grant Date Fair Value			Units			Weighted Average Grant Date Fair Value			Units			Weighted Average Grant Date Fair Value
Balance at beginning of year			29,783		$	34.18			—		$	—			3,209		$	83.88
Granted			10,534			48.51			54,602			35.33			25,036			14.99
Vested			(24,572	)		39.89			(24,819	)		36.72			(28,245	)		22.82
Forfeited			—			—			—			—			—			—
Balance at end of year			15,745		$	34.84			29,783		$	34.18			—		$	—

Compensation cost under the share and unit-based plans

		2011			2010			2009
Stock awards		$	749		$	3,086		$	6,964
Stock units			7,526			8,048			3,291
LTIP units			8,955			12,780			3,800
SARs			626			2,318			2,669
Stock options			—			402			596
Phantom stock units			980			911			643
		$	18,836		$	27,545		$	17,963

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Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits.

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