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Share and Unit-Based Plans: (Tables)

12 Months Ended

Dec. 31, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of activity of non-vested stock awards

The following table summarizes the activity of non-vested stock awards during the years ended December 31, 2015, 2014 and 2013:

	2015							2014							2013
	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	9,189			$	59.25			19,001			$	56.77			20,924			$	49.36
Granted	—			—				—			—				8,963			61.84
Vested	(7,577	)		58.67				(9,812	)		54.45				(10,886	)		46.70
Balance at end of year	1,612			$	62.01			9,189			$	59.25			19,001			$	56.77

Summary of activity of non-vested stock units

The following table summarizes the activity of non-vested stock units during the years ended December 31, 2015, 2014 and 2013:

	2015							2014							2013
	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	144,374			$	59.94			137,318			$	57.24			114,677			$	52.19
Granted	77,282			86.53				75,309			60.50				67,920			62.01
Vested	(86,761	)		61.29				(68,253	)		55.14				(45,279	)		51.59
Forfeited	(2,809	)		86.72				—			—				—			—
Balance at end of year	132,086			$	74.58			144,374			$	59.94			137,318			$	57.24

Summary of activity of SARs awards

The following table summarizes the activity of SARs awards during the years ended December 31, 2015, 2014 and 2013:

	2015							2014							2013
	Units			Weighted Average Exercise Price				Units			Weighted Average Exercise Price				Units			Weighted Average Exercise Price
Balance at beginning of year	772,639			$	56.67			1,070,991			$	56.66			1,164,185			$	56.66
Granted	—			—				—			—				—			—
Exercised	(364,807	)		56.86				(298,352	)		56.63				(93,194	)		56.63
Special dividend adjustment	9,951			55.13				—			—				—			—
Balance at end of year	417,783			$	55.13			772,639			$	56.67			1,070,991			$	56.66

Summary of activity of non-vested LTIP Units

The following table summarizes the activity of the non-vested LTIP Units during the years ended December 31, 2015, 2014 and 2013:

	2015							2014							2013
	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	46,695			$	58.89			—			$	—			200,000			$	38.63
Granted	424,442			74.71				725,908			51.71				332,189			66.58
Vested	(414,822	)		73.13				(679,213	)		51.22				(518,900	)		55.81
Forfeited	—			—				—			—				(13,289	)		66.58
Balance at end of year	56,315			$	73.24			46,695			$	58.89			—			$	—

Summary of activity of stock options

The following table summarizes the activity of stock options for the years ended December 31, 2015, 2014 and 2013:

	2015							2014							2013
	Options			Weighted Average Exercise Price				Options			Weighted Average Exercise Price				Options			Weighted Average Exercise Price
Balance at beginning of year	10,068			$	59.57			10,068			$	59.57			12,768			$	54.69
Granted	—			—				—			—				—			—
Exercised	—			—				—			—				(2,700	)		36.51
Special dividend adjustment	246			58.15				—			—				—			—
Balance at end of year	10,314			$	58.15			10,068			$	59.57			10,068			$	59.57

Summary of activity of non-vested phantom stock units

The following table summarizes the activity of the non-vested phantom stock units for the years ended December 31, 2015, 2014 and 2013:

	2015							2014							2013
	Stock Units			Weighted Average Grant Date Fair Value				Stock Units			Weighted Average Grant Date Fair Value				Stock Units			Weighted Average Grant Date Fair Value
Balance at beginning of year	9,269			$	58.35			17,575			$	58.66			—			$	—
Granted	13,351			78.72				10,747			65.54				34,266			59.04
Vested	(20,162	)		72.17				(19,053	)		62.69				(16,691	)		59.44
Forfeited	(2,458	)		55.62				—			—				—			—
Balance at end of year	—			$	—			9,269			$	58.35			17,575			$	58.66

Compensation cost under the share and unit-based plans

The following summarizes the compensation cost under the share and unit-based plans for the years ended December 31, 2015, 2014 and 2013:

	2015				2014				2013
Stock awards	$	252			$	365			$	497
Stock units	6,041				4,689				3,839
LTIP units	26,622				28,598				22,778
Stock options	16				16				16
Phantom stock units	1,444				1,205				992
	$	34,375			$	34,873			$	28,122

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Tabular disclosure of the changes in outstanding nonvested Long-Term Incentive Plan ("LTIP") units, stock awards, phantom stock and stock units.

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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

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