Income Taxes (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Line Items]
Current Liability And Defered Tax Asset For Cash Settlement	$ 114,210	$ 0
Deferred Tax Assets, Tax Credit Carryforwards, Foreign	18,000
Increase (Decrease) In Current Deferred Tax Assets	50,000
Excess Tax Benefits On Share-based Awards	7,484
Second Component Of Tax deductible goodwill	2,433
Income Tax Reconciliation, Uncertain Tax Positions Excluding Interest And Deferred Tax Assets	16,721
Unrecognized Tax Benefits, Income Tax Penalties And Interest Accrued	3,201
Uncertain Tax Position, Deferred Tax Asset	7,041
Interest Expense Net Of Deferred Tax Benefit	617
Unrecognized Tax Benefits	16,721	10,465
Noncash Capital (Distribution) Contribution Related To The Utilization Of Related Party Tax Losses By Company	(1,794)	36,867	52,824
Noncash Capital Distribution Related To Tax Credits Utilized By Related Party	2,942	2,586
Minimum [Member]
Income Taxes [Line Items]
Income Tax Examination, Year(s) Under Examination	2006
Maximum [Member]
Income Taxes [Line Items]
Income Tax Examination, Year(s) Under Examination	2008
Alternative Minimum Tax Credit [Member]
Income Taxes [Line Items]
Tax Credit Carryforward, Amount	2,100
American Taxpayer Relief Act 2012 [Member]
Income Taxes [Line Items]
Unrecognized Tax Benefits	28,000
Deferred Tax Asset For Lower Stand-alone Estimated Applicable Corporate Tax Rates [Member]
Income Taxes [Line Items]
Payments Of Capital Distribution		2,302
Deferred Tax Asset To Eliminate The Portion Relating To Share-based Compensation Expense Attributable To Related Party [Member]
Income Taxes [Line Items]
Payments Of Capital Distribution		7,292
Deferred Tax Asset For Compensation Awards That Are No Longer Anticipated To Be Realized [Member]
Income Taxes [Line Items]
Payments Of Capital Distribution		1,314
Liabilities For Uncertain Tax Positions [Member]
Income Taxes [Line Items]
Proceeds From Contributed Capital		56,409
Accrued Interest [Member]
Income Taxes [Line Items]
Proceeds From Contributed Capital		1,284
Deferred Tax Asset [Member]
Income Taxes [Line Items]
Proceeds From Contributed Capital		$ 2,358