Derivative Financial Instruments Schedule of Derivatives (Details) (USD $)	12 Months Ended																																		12 Months Ended										12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Interest Rate Swap [Member]	Dec. 31, 2011 Interest Rate Swap [Member]	Oct. 02, 2011 Interest Rate Swap [Member]	Oct. 02, 2011 Interest Rate Swap [Member] Fixed Rate Swap 1 [Member]	Oct. 02, 2011 Interest Rate Swap [Member] Fixed Rate Swap 2 [Member]	Oct. 02, 2011 Interest Rate Swap [Member] Fixed Rate Swap 3 [Member]	Oct. 02, 2011 Interest Rate Swap [Member] Fixed Rate Swap 4 [Member]	Oct. 02, 2011 Interest Rate Swap [Member] Fixed Rate Swap 5 [Member]	Oct. 02, 2011 Interest Rate Swap [Member] Fixed Rate Swap 6 [Member]	Jul. 20, 2011 Currency Swap July [Member]	Dec. 31, 2011 Cross-Currency Swap [Member]	Dec. 31, 2011 Cross-Currency Swap [Member] Fixed Rate Swap 1 [Member]	Dec. 31, 2011 Cross-Currency Swap [Member] Fixed Rate Swap 2 [Member]	May 31, 2011 Foreign Currency Swap [Member]	Dec. 31, 2012 Forward Starting Interest Rate Swap [Member]	Dec. 31, 2012 Forward Starting Interest Rate Swap [Member] Forward Starting Interest Rate Swap 1 [Member]	Dec. 31, 2012 Forward Starting Interest Rate Swap [Member] Forward Starting Interest Rate Swap 2 [Member]	Dec. 31, 2012 Forward Starting Interest Rate Swap [Member] Forward Starting Interest Rate Swap 3 [Member]	Dec. 31, 2012 Forward Starting Interest Rate Swap [Member] Forward Starting Interest Rate Swap 4 [Member]	Dec. 31, 2012 Forward Starting Interest Rate Swap [Member] Forward Starting Interest Rate Swap 5 [Member]	Dec. 31, 2012 Forward Starting Interest Rate Swap [Member] Forward Starting Interest Rate Swap 6 [Member]	Dec. 31, 2012 Forward Starting Interest Rate Swap [Member] Forward Starting Interest Rate Swap 7 [Member]	Dec. 31, 2012 Forward Starting Interest Rate Swap [Member] Forward Starting Interest Rate Swap 8 [Member]	Dec. 31, 2012 Forward Starting Interest Rate Swap [Member] Forward Starting Interest Rate Swap 9 [Member]	Dec. 31, 2012 Forward Starting Interest Rate Swap [Member] Forward Starting Interest Rate Swap 10 [Member]	Dec. 31, 2012 Forward Starting Interest Rate Swap [Member] Forward Starting Interest Rate Swap 11 [Member]	Dec. 31, 2012 Cash Flow Hedging [Member] Interest Rate Swap [Member]	Dec. 31, 2012 Cash Flow Hedging [Member] Cross-Currency Swap [Member]	Dec. 31, 2012 Cash Flow Hedging [Member] Forward Starting Interest Rate Swap [Member] September 2010 Swaps [Member]	Sep. 25, 2011 Cash Flow Hedging [Member] Forward Starting Interest Rate Swap [Member] September 2010 Swaps [Member]	Feb. 28, 2011 Cash Flow Hedging [Member] Forward Starting Interest Rate Swap [Member] September 2010 Swaps [Member]	Dec. 31, 2012 Cash Flow Hedging [Member] Forward Starting Interest Rate Swap [Member] September 2010 and March 2011 Swaps [Member]	Oct. 30, 2011 Cash Flow Hedging [Member] Forward Starting Interest Rate Swap [Member] September 2010 and March 2011 Swaps [Member]	Dec. 31, 2012 Cash Flow Hedging [Member] Forward Starting Interest Rate Swap [Member] May 2011 Swaps [Member] contract	Dec. 31, 2012 Libor 30 Day [Member]	Oct. 31, 2009 Designated As Hedging [Member] Cash Flow Hedging [Member] Interest Rate Swap [Member]	Aug. 31, 2009 Designated As Hedging [Member] Cash Flow Hedging [Member] Cross-Currency Swap [Member]	Dec. 31, 2012 Not Designated As Hedging [Member] Cross-Currency Swap [Member]	Dec. 31, 2011 Not Designated As Hedging [Member] Cross-Currency Swap [Member]	Dec. 31, 2012 Not Designated As Hedging [Member] Foreign Currency Swap [Member]	Dec. 31, 2011 Not Designated As Hedging [Member] Foreign Currency Swap [Member]	Dec. 31, 2012 Amended 2010 Credit Agreement [Member]
Derivative [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number	210,504	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price	$ 29.53	$ 0.00
Percentage of foreign currency termination swapped													25.00%
Amortization of deferred hedge gains				$ 16,000	$ 33,600,000
Notional amount						1,000,000,000	200,000,000	200,000,000	200,000,000	200,000,000	100,000,000	100,000,000		255,825,000	255,000,000	825,000		800,000,000	200,000,000	75,000,000	50,000,000	150,000,000	50,000,000	50,000,000	25,000,000	50,000,000	30,000,000	70,000,000	50,000,000
Fixed interest rate							5.64%	5.64%	5.64%	5.57%	5.60%	5.60%			7.31%	9.50%			2.3975%	2.4255%	2.4205%	2.5545%	2.4205%	2.5545%	2.4255%	2.54%	2.54%	2.54%	2.54%
Average rate						5.62%								7.32%				2.47875%																	2.46%		2.54%
Net effect of swaps	(1,492,000)	(13,119,000)	18,194,000																																(3,300,000)
Amount of hedged item																														800,000,000	268,700,000		600,000,000			600,000,000	200,000,000
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax																																6,000,000		7,200,000					91,800,000	15,100,000
Required Percentage To Swap Term Debt To Fixed Rate Debt																	50.00%
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Amortizable Portion, Effect Net of Tax																																2,100,000
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash FLow Hedges, Unamortizable Portion, Effect Net of Tax																																3,900,000
Number of derivative instruments																																					4
Debt instrument, LIBOR floor, decrease to percent	1.00%
Debt instrument, LIBOR floor, decrease from percent	1.50%
Variable interest rate																																						0.21%
Aggregate term debt and senior notes subject to interest rate protection requirement																																													50.00%
Current derivative liability	$ 0	$ (50,772,000)																																							$ 0	$ (37,617,000)	$ 0	$ (13,155,000)
Granted	280,672	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	$ 29.53	$ 0.00
Vested	70,168