Long-Term Debt (Details)	6 Months Ended			6 Months Ended					6 Months Ended			6 Months Ended		1 Months Ended
	Jun. 30, 2012 USD ($)	Jun. 30, 2011 USD ($)	Dec. 31, 2011 USD ($)	Jun. 30, 2012 STARS [Member] USD ($)	Jun. 30, 2012 Senior Note June 2021 [Member] USD ($)	May 21, 2011 Senior Note June 2021 [Member] USD ($)	May 23, 2011 Credit Agreement [Member] USD ($)	May 23, 2011 Revolving Line of Credit March 2016 [Member] USD ($)	Jun. 30, 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 ($)	Jun. 30, 2012 Term Loan due March 2016 [Member] USD ($)	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 ($)	Mar. 31, 2012 Acquisition Notes [Member] Non Interest Bearing Acquisition Note [Member] USD ($)	Jun. 30, 2012 Acquisition Notes [Member] Non Interest Bearing Acquisition Note [Member] USD ($)	Dec. 31, 2011 Acquisition Notes [Member] Non Interest Bearing Acquisition Note [Member] USD ($)	Jun. 30, 2011 Acquisition Notes [Member] Non Interest Bearing Acquisition Note [Member] USD ($)	Jun. 30, 2012 Notes Payable to Banks [Member] Senior Note June 2021 [Member] USD ($)	Dec. 31, 2011 Notes Payable to Banks [Member] Senior Note June 2021 [Member] USD ($)	Jun. 30, 2012 Notes Payable to Banks [Member] Senior Debentures August 2014 [Member] USD ($)	Dec. 31, 2011 Notes Payable to Banks [Member] Senior Debentures August 2014 [Member] USD ($)	Jun. 30, 2012 Notes Payable to Banks [Member] Senior Debentures April 2028 [Member] USD ($)	Dec. 31, 2011 Notes Payable to Banks [Member] Senior Debentures April 2028 [Member] USD ($)	Jun. 30, 2012 Subordinated Debt [Member] Deferrable Interest Subordinated Noted Due April 2012 [Member] USD ($)	Dec. 31, 2011 Subordinated Debt [Member] Deferrable Interest Subordinated Noted Due April 2012 [Member] USD ($)	Jun. 30, 2012 Line of Credit [Member] Revolving Line of Credit March 2016 [Member] USD ($)	Jun. 30, 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 ($)	Jun. 30, 2012 Bank Loans [Member] Term Loan due March 2016 [Member] USD ($)	Dec. 31, 2011 Bank Loans [Member] Term Loan due March 2016 [Member] USD ($)	Jun. 30, 2012 Notes Payable, Other Payables [Member] Various Interest Rate Loans [Member] USD ($)	Dec. 31, 2011 Notes Payable, Other Payables [Member] Various Interest Rate Loans [Member] USD ($)
Long-Term Debt
Total long-term Debt	$ 794,615,000		$ 908,295,000														$ 8,503,000	$ 13,209,000		$ 393,000,000	$ 400,000,000	$ 1,175,000	$ 1,175,000	$ 59,645,000	$ 59,645,000	$ 0	$ 34,768,000	$ 51,190,000	50,000,000	$ 51,045,000	$ 280,000,000	$ 341,250,000	$ 1,102,000	$ 7,203,000
Less current portion of long-term debt	955,000		62,268,000
Long-term debt, net of current portion	793,660,000		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%
Repayments of Debt					7,000,000				43,800,000			61,300,000
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	3,700,000		4,400,000
Gains (Losses) on Extinguishment of Debt	(353,000)	(10,190,000)
Payments to Acquire Interest in Joint Venture				20,000,000
Debt Instrument Amount Of Installment														$ 5,000,000	$ 5,000,000	$ 5,000,000