Compensation Plans: Stock Based (Details) (USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Equity Plan
Number of shares available for grant	3,800,000
Impact outright issuance of one share has on number of available shares	1
Impact of issuance of one performance share award on available shares under the equity incentive plan	2
Director Shares
Stock-based compensation expense	$ 32,347,000		$ 30,185,000		$ 26,824,000
Shares Issued to the Board of Directors [Member]
Director Shares
Stock issued from treasury to non-employee directors (in shares)	28,169		30,486		21,568
Stock-based compensation expense	1,400,000		1,300,000		1,200,000
Performance Shares [Member]
Equity Plan
Unrecognized stock based compensation expense	18,800,000
RSUs
Non-vested at the beginning of the period (in shares)	669,308	[1]	885,894	[1]	1,110,666	[1]
Granted (in shares)	274,831	[1]	314,853	[1]	266,282	[1]
Vested (in shares)	(345,005)	[1]	(493,679)	[1]	(364,172)	[1]
Forfeited (in shares)	(26,665)	[1]	(37,760)	[1]	(126,882)	[1]
Non-vested at the end of the period (in shares)	572,469	[1]	669,308	[1]	885,894	[1]
Weighted Average Grant Date Fair Value
Non-vested outstanding at the beginning of the period (in dollars per share)	$ 63.91	[1]	$ 57.52	[1]	$ 39.48	[1]
Granted (in dollars per share)	$ 64.13	[1]	$ 51.98	[1]	$ 91.45	[1]
Vested (in dollars per share)	$ 60.06	[1]	$ 44.72	[1]	$ 35.74	[1]
Forfeited (in dollars per share)	$ 69.74	[1]	$ 65.35	[1]	$ 33.32	[1]
Non-vested outstanding at the end of the period (in dollars per share)	$ 66.07	[1]	$ 63.91	[1]	$ 57.52	[1]
Multiplier assumed	1
Performance measurement period	3
Common stock awards vesting multiplier, low end of range	0
Common stock awards vesting multiplier, high end of range	2
Fair value of PSUs/RSUs Granted in Period	17,600,000		16,400,000		24,300,000
PSU/RSU Vesting Increment	0.33
Fair value of PSUs/RSUs Vested in Period	20,700,000		22,100,000		13,000,000
Multiplier Applied to PSU Awards at Settlement	1.725		2		0.8
Stock issued for settlement, PSU, net of tax (in shares)	387,461		812,562		206,468
Shares held for settlement of income and payroll tax obligations (in shares)	200,050		406,866		98,955
Director Shares
Stock-based compensation expense	16,800,000		18,200,000		19,700,000
First Anniversary [Member] | Performance Shares [Member]
Weighted Average Grant Date Fair Value
PSU/RSU Vesting Increment			0.14
Second Anniversary [Member] | Performance Shares [Member]
Weighted Average Grant Date Fair Value
PSU/RSU Vesting Increment			0.29
Third Anniversary [Member] | Performance Shares [Member]
Weighted Average Grant Date Fair Value
PSU/RSU Vesting Increment			0.57
Cash Bonus Plan [Member]
Cash Bonus Plan
Percent of base compensation	200.00%
Accrued cash bonus plan expense	$ 41,800,000		$ 16,300,000		$ 23,900,000

[1] The number of awards assumes a one multiplier. The final number of shares of common stock issued may vary depending on the ending three-year performance multiplier, which ranges from zero to two.