Share Based Compensation (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Options [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	21,100,000
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]
Common Stock, Capital Shares Reserved for Future Issuance	6,637,761	7,156,179	7,899,926
ESPP [Member]
Options [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	750,000
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]
ESPP, Maximum percent of salary contributed	10.00%
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Purchase Date	15.00%
Employee Stock Ownership Plan (ESOP), Shares Contributed to ESOP	16,793	18,611	18,818
Employee Stock Ownership Plan (ESOP), Compensation Expense	$ 71,000	$ 99,000	$ 67,000
Stock Options [Member]
Options [Abstract]
option term	10 years
Option - Vesting Period	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 7.18	$ 6.55	$ 6.17
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit	$ 20.32
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit	$ 49.74
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term	5 years 0 months 3 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	3 years 11 months 8 days
Exercise Price Higher than Stock Price, shares	920,000
Options Exercise Price Lower than Share Price, Shares	870,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value	4,900,000	5,900,000	900,000
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options	15,200,000	22,900,000	7,600,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Stock Options	458,000
Option Expense Not Yet Recognized Period for Recognition	0 years 8 months 30 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	2,900,000
Allocated Share-based Compensation Expense	1,600,000	1,700,000	1,700,000
Long Term Incentive Shares [Abstract]
Long Term Incentive Shares - Vesting Period	3 years
Allocated Share-based Compensation Expense	1,600,000	1,700,000	1,700,000
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]
Allocated Share-based Compensation Expense	1,600,000	1,700,000	1,700,000
Stock Options [Member] | First Anniversary of Grant Date [Member]
Options [Abstract]
option vesting percent, year one	20.00%
Stock Options [Member] | Second Anniversary of Grant Date [Member]
Options [Abstract]
option vesting percent, year one	50.00%
Stock Options [Member] | Third Anniversary of Grant Date [Member] [Member]
Options [Abstract]
option vesting percent, year one	100.00%
Long Term Incentive Shares [Member]
Options [Abstract]
Option - Vesting Period	5 years
Allocated Share-based Compensation Expense	9,100,000	8,700,000	8,200,000
Long Term Incentive Shares [Abstract]
Weighted Average Grant Date Fair Value - Granted	$ 39.42	$ 34.61	$ 33.62
Long Term Incentive Shares - Vesting Period	5 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Term	1 year 6 months 8 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	251,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value	9,900,000	8,700,000	6,200,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	13,000,000
Allocated Share-based Compensation Expense	9,100,000	8,700,000	8,200,000
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]
Allocated Share-based Compensation Expense	9,100,000	8,700,000	8,200,000
2008 Plan [Member] | First portion of RSU [Member] | Third Anniversary of Grant Date [Member] [Member]
Options [Abstract]
Option - Vesting Period	3 years
Long Term Incentive Shares [Abstract]
Long Term Incentive Shares - Vesting Period	3 years
2008 Plan [Member] | Second portion of RSU [Member]
Options [Abstract]
Option - Vesting Period	3 years
Long Term Incentive Shares [Abstract]
Long Term Incentive Shares - Vesting Period	3 years
shares in lieu of bonus [Member]
Options [Abstract]
Allocated Share-based Compensation Expense	3,100,000	2,900,000	2,800,000
Long Term Incentive Shares [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	79,271	80,573	85,471
Allocated Share-based Compensation Expense	3,100,000	2,900,000	2,800,000
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]
Percent Applied to Bonuses Taken in Cash	120.00%
Allocated Share-based Compensation Expense	3,100,000	2,900,000	2,800,000
Profit Sharing Plan [Member]
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]
Other Labor-related Expenses	$ 698,000	$ 564,000	$ 868,000
Deferred Profit Sharing [Member] | Profit Sharing Plan [Member]
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]
ESPP, Maximum percent of salary contributed	5.00%
2013 [Member] | Chief Executive Officer [Member] | 2008 Plan [Member] | Third Anniversary of Grant Date [Member] [Member] | Maximum [Member]
Options [Abstract]
option vesting percent, year one	272.00%
2013 [Member] | Chief Executive Officer [Member] | 2008 Plan [Member] | First portion of RSU [Member]
Long Term Incentive Shares [Abstract]
Monte Carlo RSU Valuation	150.00%
2013 [Member] | Executives Other [Member] | 2008 Plan [Member] | Third Anniversary of Grant Date [Member] [Member] | Maximum [Member]
Options [Abstract]
option vesting percent, year one	200.00%
2013 [Member] | Executives Other [Member] | 2008 Plan [Member] | First portion of RSU [Member]
Long Term Incentive Shares [Abstract]
Monte Carlo RSU Valuation	121.00%
2012 [Member] | Chief Executive Officer [Member] | 2008 Plan [Member] | Third Anniversary of Grant Date [Member] [Member] | Maximum [Member]
Options [Abstract]
option vesting percent, year one		272.00%
2012 [Member] | Chief Executive Officer [Member] | 2008 Plan [Member] | First portion of RSU [Member]
Long Term Incentive Shares [Abstract]
Monte Carlo RSU Valuation		159.00%
2012 [Member] | Chief Executive Officer [Member] | 2008 Plan [Member] | First portion of RSU [Member] | Third Anniversary of Grant Date [Member] [Member]
Options [Abstract]
Option - Vesting Period	3 years
Long Term Incentive Shares [Abstract]
Long Term Incentive Shares - Vesting Period	3 years
2012 [Member] | Executives Other [Member] | 2008 Plan [Member] | Third Anniversary of Grant Date [Member] [Member] | Maximum [Member]
Options [Abstract]
option vesting percent, year one		200.00%
2012 [Member] | Executives Other [Member] | 2008 Plan [Member] | First portion of RSU [Member]
Long Term Incentive Shares [Abstract]
Monte Carlo RSU Valuation		127.00%
2012 [Member] | Executives Other [Member] | 2008 Plan [Member] | First portion of RSU [Member] | Third Anniversary of Grant Date [Member] [Member]
Options [Abstract]
Option - Vesting Period	3 years
Long Term Incentive Shares [Abstract]
Long Term Incentive Shares - Vesting Period	3 years
2011 [Member] | Executives, all [Member] | 2008 Plan [Member] | First portion of RSU [Member]
Long Term Incentive Shares [Abstract]
Monte Carlo RSU Valuation			146.00%
2011 [Member] | Chief Executive Officer [Member] | 2008 Plan [Member] | Third Anniversary of Grant Date [Member] [Member] | Maximum [Member]
Options [Abstract]
option vesting percent, year one			200.00%
2011 [Member] | Executives Other [Member] | 2008 Plan [Member] | Third Anniversary of Grant Date [Member] [Member] | Maximum [Member]
Options [Abstract]
option vesting percent, year one			200.00%