CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Total	Paid-in Capital	Retained Earnings	Class A Common Stock	Class B Non-Voting Common Stock
Balance at Dec. 31, 2012	$ 2,332,621	$ 2,198,501	$ 133,111	$ 991	$ 18
Balance (in shares) at Dec. 31, 2012				99,417,998	1,829,339
Increase (Decrease) in Shareholders' Equity
Common stock issued (in shares)				63,899
Stock based compensation expense	6,775	6,775
Cash dividends declared	(2,532)		(2,532)
Tax withholding related to vesting of restricted stock units	(1,742)	(1,742)
Tax withholding related to vesting of restricted stock units (in shares)				(26,558)
Net income	39,996		39,996
Balance at Mar. 31, 2013	$ 2,375,118	$ 2,203,534	$ 170,575	$ 991	$ 18
Balance (in shares) at Mar. 31, 2013				99,455,339	1,829,339