Schedule II - Valuation and Qualifying Accounts and Reserves (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	$ 3,733	$ 4,441	$ 5,644
Additions Charged to expense	5,681	1,860	2,323
Additions Charged to Other accounts	1,146	0	0
Deductions for purpose for which accounts were set up	3,551	2,568	3,526
Balance at end of period	6,263	3,733	4,441
Insurance Reserves [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	2,483	3,233	4,523
Additions Charged to expense	5,658	1,818	1,913
Additions Charged to Other accounts	1,141	0	0
Deductions for purpose for which accounts were set up	3,551	2,568	3,203
Balance at end of period	4,985	2,483	3,233
Other Reserves [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	1,250	1,208	1,121
Additions Charged to expense	23	42	410
Additions Charged to Other accounts	5	0	0
Deductions for purpose for which accounts were set up	0	0	323
Balance at end of period	$ 1,278	$ 1,250	$ 1,208