5. Notes Payable and Long-Term Debt (Details) (USD $)	1 Months Ended			12 Months Ended					1 Months Ended				1 Months Ended						1 Months Ended
	Sep. 30, 2013	Jan. 31, 2011	Dec. 31, 2010	Dec. 31, 2013	Dec. 31, 2012	May 31, 2009	Dec. 31, 2013 Foreign Line of Credit [Member]	Dec. 31, 2012 Foreign Line of Credit [Member]	Jan. 31, 2011 Subordinated Debt [Member] Senior Subordinated Notes 7.5% [Member]	Dec. 31, 2013 Subordinated Debt [Member] Senior Subordinated Notes 8.0% [Member]	Dec. 31, 2012 Subordinated Debt [Member] Senior Subordinated Notes 8.0% [Member]	May 31, 2009 Subordinated Debt [Member] Senior Subordinated Notes 8.0% [Member]	Dec. 31, 2010 Subordinated Debt [Member] Senior Subordinated Notes 6.125% [Member]	Dec. 31, 2013 Unsecured Debt [Member] Senior Notes 4.875% [Member]	Dec. 31, 2012 Unsecured Debt [Member] Senior Notes 4.875% [Member]	Dec. 31, 2010 Unsecured Debt [Member] Senior Notes 4.875% [Member]	Dec. 31, 2013 Capital Lease Obligations [Member] Capital leases and other debt [Member]	Dec. 31, 2012 Capital Lease Obligations [Member] Capital leases and other debt [Member]	Jun. 30, 2010 Line of Credit [Member]	Dec. 31, 2013 Line of Credit [Member]
Debt Instrument [Line Items]
Long-term debt				$ 435,800,000	$ 732,600,000					$ 0	$ 296,900,000	$ 294,800,000		$ 423,200,000	$ 423,000,000	$ 422,600,000	$ 12,600,000	$ 12,700,000
Less current maturities				(200,000)	(200,000)
Long-term debt, net of current maturities				435,615,000	732,414,000
Debt Instrument, Interest Rate, Effective Percentage																4.946%
Face amount of debt sold												300,000,000				425,000,000
Debt Instrument, Interest Rate, Stated Percentage						8.00%			7.50%				6.125%			4.875%
Repayments of subordinated debt									225,000,000				200,000,000
Early repayment of Subordinated Notes	312,000,000								234,600,000				204,300,000
Redemption Premium	12,000,000	2,800,000	4,100,000
Debt Instrument, Unamortized Discount	2,500,000
Unamortized Debt Issuance Expense	1,100,000
Gains (Losses) on Extinguishment of Debt				(15,600,000)
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				200,000
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				200,000
Long-term Debt, Maturities, Repayments of Principal after Year Five				434,800,000
Line of Credit Facility, Maximum Borrowing Capacity							20,100,000	27,900,000												200,000,000
Line of Credit Facility, Amount Outstanding																				0
Line of Credit Facility, Remaining Borrowing Capacity							$ 15,800,000	$ 23,800,000
Line of Credit Facility, Interest Rate at Period End							3.00%	3.20%												2.00%