5. Notes Payable and Long-Term Debt (Details) (USD $)					1 Months Ended							1 Months Ended							1 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 Line of credit held by international subsidiaries [Member]	Dec. 31, 2010 Line of credit held by international subsidiaries [Member]	Jan. 31, 2011 Subordinated Debt [Member] Senior Subordinated Notes 7.5% [Member]	Dec. 31, 2011 Subordinated Debt [Member] Senior Subordinated Notes 7.5% [Member]	Dec. 31, 2010 Subordinated Debt [Member] Senior Subordinated Notes 7.5% [Member]	Aug. 31, 2003 Subordinated Debt [Member] Senior Subordinated Notes 7.5% [Member]	Dec. 31, 2011 Subordinated Debt [Member] Senior Subordinated Notes 8.0% [Member]	Dec. 31, 2010 Subordinated Debt [Member] Senior Subordinated Notes 8.0% [Member]	May 31, 2009 Subordinated Debt [Member] Senior Notes 4.875% [Member]	Dec. 31, 2010 Subordinated Debt [Member] Senior Subordinated Notes 6.125% [Member]	Dec. 31, 2004 Subordinated Debt [Member] Senior Subordinated Notes 6.125% [Member]	Dec. 31, 2010 Unsecured Debt [Member] Senior Subordinated Notes 8.0% [Member]	Dec. 31, 2011 Unsecured Debt [Member] Senior Notes 4.875% [Member]	Dec. 31, 2010 Unsecured Debt [Member] Senior Notes 4.875% [Member]	Dec. 31, 2011 Capital Lease Obligations [Member] Capital leases and other debt [Member]	Dec. 31, 2010 Capital Lease Obligations [Member] Capital leases and other debt [Member]	Jun. 30, 2010 Line of Credit [Member]	Dec. 31, 2011 Line of Credit [Member]
Debt Instrument [Line Items]
Long-term debt	$ 732,300,000	$ 964,200,000				$ 0	$ 225,000,000		$ 296,300,000	$ 295,600,000	$ 294,800,000				$ 422,800,000	$ 422,600,000	$ 13,200,000	$ 21,000,000
Less current maturities	(600,000)	(233,100,000)
Long-term debt, net of current maturities	731,698,000	731,100,000
Debt Instrument, Interest Rate, Effective Percentage											8.30%			4.946%
Face amount of debt sold								225,000,000			300,000,000		200,000,000	425,000,000
Debt Instrument, Interest Rate, Stated Percentage								7.50%			8.00%		6.125%	4.875%
Repayments of subordinated debt					225,000,000							200,000,000
Early repayment of Subordinated Notes					234,600,000							204,300,000
Percentage of capital stock of certain foreign subsidiaries securing part of Credit Agreement																			65.00%
Maturities of Long-term Debt [Abstract]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	600,000
Long-term Debt, Maturities, Repayments of Principal in Year Two	200,000
Long-term Debt, Maturities, Repayments of Principal in Year Three	200,000
Long-term Debt, Maturities, Repayments of Principal in Year Four	200,000
Long-term Debt, Maturities, Repayments of Principal in Year Five	296,500,000
Long-term Debt, Maturities, Repayments of Principal after Year Five	434,700,000
Line of Credit Facility, Maximum Borrowing Capacity			21,900,000	51,200,000																200,000,000
Line of Credit Facility, Amount Outstanding																				0
Line of Credit Facility, Remaining Borrowing Capacity			$ 17,500,000	$ 48,000,000
Line of Credit Facility, Interest Rate at Period End			2.70%	1.40%