CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Total	Preferred Stock	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
Issuance of restricted stock units (in shares)					954,405
Exercise of stock options (in shares)					500
Common stock issued (in shares)					954,905
Stock based compensation expense	14,088		14,088
Cash dividends	(5,065)			(5,065)
Tax withholding related to exercise of stock options and vesting of restricted stock units	(13,603)		(13,603)
Tax withholding related to exercise of stock options and vesting of restricted stock units (in shares)					(448,515)
Net income	82,986			82,986
Balance at Jun. 30, 2013	$ 2,411,027	$ 0	$ 2,198,986	$ 211,032	$ 991	$ 18
Balance (in shares) at Jun. 30, 2013					99,924,388	1,829,339