Income Taxes - Effective income tax reconciliation (Details)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Effective Income Tax Rate, Tax Rate Reconciliation
Statutory rate	35.00%	35.00%	35.00%
Effect of:
State and local income taxes, net of federal income tax benefit	4.40%	2.10%	(1.80%)
Reserve for uncertain tax positions	35.70%	(7.30%)	(1.90%)
Amended returns, settlements and other	16.50%	0.00%	7.60%
Effective income tax rate	91.60%	29.80%	38.90%