Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Tax benefit or expenses related to delivery of Class A Common Stock in connection with share-based incentive compensation	$ 40	$ 972	$ 972
Class A Common Stock [Member]
Common stock, issued	129,056,081	128,216,423	123,009,311
Class B Common Stock [Member]
Common stock, issued	1	1	1