Income Taxes Components of Income Tax Expense (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Income Tax Expense Components [Line Items]
Deferred Income Tax Expense (Benefit) Continuing and Discontinued Operations																	$ 10,313		$ 3,648		$ 7,798
Income Tax Expense (Benefit)	7,303	[1]	8,557	[1]	10,551	[1]	5,897	[1]	6,115	[1]	5,124	[1]	5,240	[1]	3,851	[1]	32,308	[2]	20,330	[2]	14,280	[2]
Income Tax Expense Components, Continuing Operations [Member]
Income Tax Expense Components [Line Items]
Current Federal Tax Expense (Benefit)																	17,103		12,253		3,859
Current State and Local Tax Expense (Benefit)																	6,622		4,100		2,769
Current Income Tax Expense (Benefit)																	23,725		16,353		6,628
Deferred Federal Income Tax Expense (Benefit)																	6,153		3,534		6,680
Deferred State and Local Income Tax Expense (Benefit)																	2,430		443		972
Deferred Income Tax Expense (Benefit) Continuing and Discontinued Operations																	8,583		3,977		7,652
Income Tax Expense (Benefit)																	$ 32,308		$ 20,330		$ 14,280

[1] Due to rounding, the sum of the four quarters may not add to the year to date total.

[2] The Company’s effective tax rate for 2013, 2012, and 2011 are not consistent due to earnings from tax-exempt investments, non-deductible compensation, state and local taxes, income tax credits and income attributable to noncontrolling interests having a different impact on the effective tax rate due primarily to the different levels of income before taxes in years 2013, 2012, and 2011. See Part II. Item 8. “Financial Statements and Supplementary Data - Note 17: Income Taxes” for additional details.