Income Taxes (Deferred Tax Assets and Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Income Taxes [Abstract]
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts	$ 7,526	$ 8,833
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation	3,421	3,026
Deferred Tax Assets, Investments	3,632	3,628
Deferred Tax Assets, Tax Credit Carryforwards	4,607	6,412
Deferred Tax Assets, Other	516	1,203
Deferred Tax Assets, Gross	19,702	23,102
Deferred Tax Liabilities, Property, Plant and Equipment	1,536	1,478
Deferred Tax Liabilities, Tax Deferred Income	1,442	1,398
Deferred Tax Liabilities, Deferred Expense, Deferred Financing Costs	5,460	4,733
Deferred Tax liabilities, Unrealized Gains on Available-for-Sale Securities, Gross	3,711	4,005
Deferred Tax Liabilities, Other	1,830	1,584
Deferred Tax Liabilities, Gross	13,979	13,198
Deferred Tax Assets, Net	$ 5,723	$ 9,904