Long-Term Debt (Details)	3 Months Ended			3 Months Ended					3 Months Ended				1 Months Ended
	Mar. 31, 2012 USD ($)	Mar. 31, 2011 USD ($)	Dec. 31, 2011 USD ($)	Mar. 31, 2012 STARS [Member] USD ($)	Mar. 31, 2012 Senior Note June 2021 [Member] USD ($)	May 21, 2011 Senior Note June 2021 [Member] USD ($)	May 23, 2011 Credit Agreement [Member] USD ($)	May 23, 2011 Revolving Line of Credit March 2016 [Member] USD ($)	Mar. 31, 2012 Multi Currency Sub Facility [Member] USD ($)	May 23, 2011 Multi Currency Sub Facility [Member] USD ($)	May 23, 2011 Letter Of Credit Sub Facility [Member] USD ($)	May 23, 2011 Term Loan due March 2016 [Member] USD ($)	Mar. 31, 2016 Acquisition Notes [Member] Non Interest Bearing Acquisition Note [Member] USD ($)	Mar. 31, 2014 Acquisition Notes [Member] Non Interest Bearing Acquisition Note [Member] USD ($)	Mar. 31, 2012 Acquisition Notes [Member] Non Interest Bearing Acquisition Note [Member] USD ($)	Dec. 31, 2011 Acquisition Notes [Member] Non Interest Bearing Acquisition Note [Member] USD ($)	Mar. 31, 2011 Acquisition Notes [Member] Non Interest Bearing Acquisition Note [Member] USD ($)	Mar. 31, 2012 Notes Payable to Banks [Member] Senior Note June 2021 [Member] USD ($)	Dec. 31, 2011 Notes Payable to Banks [Member] Senior Note June 2021 [Member] USD ($)	Mar. 31, 2012 Notes Payable to Banks [Member] Senior Debentures August 2014 [Member] USD ($)	Dec. 31, 2011 Notes Payable to Banks [Member] Senior Debentures August 2014 [Member] USD ($)	Mar. 31, 2012 Notes Payable to Banks [Member] Senior Debentures April 2028 [Member] USD ($)	Dec. 31, 2011 Notes Payable to Banks [Member] Senior Debentures April 2028 [Member] USD ($)	Mar. 31, 2012 Subordinated Debt [Member] Deferrable Interest Subordinated Noted Due April 2012 [Member] USD ($)	Dec. 31, 2011 Subordinated Debt [Member] Deferrable Interest Subordinated Noted Due April 2012 [Member] USD ($)	Mar. 31, 2012 Line of Credit [Member] Revolving Line of Credit March 2016 [Member] USD ($)	Mar. 31, 2012 Line of Credit [Member] Revolving Line of Credit March 2016 [Member] AUD	Dec. 31, 2011 Line of Credit [Member] Revolving Line of Credit March 2016 [Member] USD ($)	Mar. 31, 2012 Bank Loans [Member] Term Loan due March 2016 [Member] USD ($)	Dec. 31, 2011 Bank Loans [Member] Term Loan due March 2016 [Member] USD ($)	Mar. 31, 2012 Notes Payable, Other Payables [Member] Various Interest Rate Loans [Member] USD ($)	Dec. 31, 2011 Notes Payable, Other Payables [Member] Various Interest Rate Loans [Member] USD ($)
Debt Instrument [Line Items]
Repayments of Long-term Debt	$ 52,247,000	$ 211,320,000
Total long-term Debt	856,733,000		908,295,000												8,378,000	13,209,000		393,000,000	400,000,000	1,175,000	1,175,000	59,645,000	59,645,000	34,768,000	34,768,000	51,730,000	50,000,000	51,045,000	306,250,000	341,250,000	1,787,000	7,203,000
Less current portion of long-term debt	36,377,000		62,268,000
Long-term debt, net of current portion	820,356,000		846,027,000
Debt Instrument, Face Amount						400,000,000											15,000,000
Debt Instrument, Interest Rate, Stated Percentage						7.25%												7.25%		5.70%		7.55%		8.50%		6.80%	6.80%		4.00%
Line of Credit Facility, Maximum Borrowing Capacity							1,400,000,000	550,000,000		100,000,000	50,000,000	350,000,000
Accrued Interest Expense Debt	13,400,000		4,400,000
Gains (Losses) on Extinguishment of Debt	(326,000)	0
Payments to Acquire Interest in Joint Venture				20,000,000
Repayments of Debt					7,000,000				30,600,000
Debt Instrument Amount Of Installment													$ 5,000,000	$ 5,000,000	$ 5,000,000