Consolidated Statement of Stockholders' Equity (Deficiency) (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Deficit [Member]	Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]
Beginning Balance at Dec. 31, 2008	$ 33,605	$ 6,601	$ 65,103	$ 0	$ (25,242)	$ (12,857)
Beginning Balance, Shares at Dec. 31, 2008		66,014,070
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	24,806			24,806
Change in net loss and prior service cost, net of taxes	6,232				6,232
Forward contract adjustments, net of taxes	34				34
Unrealized gain on investment securities, net of taxes	4,097				4,097
Total other comprehensive income	10,363
Total comprehensive income	35,169
Distributions and dividends on common stock	(112,583)		(88,110)	(24,473)
Restricted stock grant (shares)		500,000
Restricted stock grant	50	50
Effect of stock dividend	0	333		(333)
Effect of stock dividend, shares		3,326,623
Tax benefit of options exercised	9,162		9,162
Exercise of employee stock options, net of shares to pay exercie price	1,144	158	986
Exercise of employee stock options, net of shares to pay exercise price, shares	4,849,486	1,582,074
Surrender of shares in connection with option exercise and restricted stock vesting, shares		(160,083)
Surrender of shares in connection with employee stock option exercise and restricted stock vesting	(2,314)	(16)	(2,298)
Amortization of deferred compensation	3,642		3,642
Beneficial conversion feature of notes payable, net of taxes	27,443		27,443
Ending Balance at Dec. 31, 2009	(4,682)	7,126	15,928	0	(14,879)	(12,857)
Ending Balance, Shares at Dec. 31, 2009		71,262,684
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	54,084			54,084
Change in net loss and prior service cost, net of taxes	2,938				2,938
Forward contract adjustments, net of taxes	42				42
Unrealized loss on long term investments accounted for under the equity method, net of income taxes	669				669
Change in net unrealized gain on investment securities, net of taxes	27,607				27,607
Net unrealized gains reclassified into net income, net of income taxes	(11,921)				(11,921)
Unrealized gain on investment securities, net of taxes	15,686
Total other comprehensive income	19,335
Total comprehensive income	73,419
Distributions and dividends on common stock	(118,135)		(19,081)	(99,054)
Restricted stock grant (shares)		50,000
Restricted stock grant	0	5	(5)
Surrender of shares in connection with restricted stock vesting, shares		(51,941)
Surrender of shares in connection with restricted stock vesting	(1,040)	(5)	(1,035)
Effect of stock dividend	0	357		(357)
Effect of stock dividend, shares		3,567,023
Tax benefit of options exercised	269		269
Exercise of employee stock options, net of shares to pay exercie price	1,265	11	1,254
Exercise of employee stock options, net of shares to pay exercise price, shares	122,085	111,518
Amortization of deferred compensation	2,670		2,670
Ending Balance at Dec. 31, 2010	(46,234)	7,494	0	(45,327)	4,456	(12,857)
Ending Balance, Shares at Dec. 31, 2010		74,939,284
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	75,020			75,020
Change in net loss and prior service cost, net of taxes	(5,998)				(5,998)
Forward contract adjustments, net of taxes	39				39
Unrealized loss on long term investments accounted for under the equity method, net of income taxes	(2,143)				(2,143)
Change in net unrealized gain on investment securities, net of taxes	13,784				13,784
Net unrealized gains reclassified into net income, net of income taxes	(13,815)				(13,815)
Unrealized gain on investment securities, net of taxes	(31)
Total other comprehensive income	(8,133)
Total comprehensive income	66,887
Distributions and dividends on common stock	(124,970)		(15,215)	(109,755)
Restricted stock grant (shares)		6,667
Restricted stock grant		1	(1)
Surrender of shares in connection with restricted stock vesting, shares		(112,429)
Surrender of shares in connection with restricted stock vesting	(1,961)	(11)	(1,950)
Effect of stock dividend	0	378		(378)
Effect of stock dividend, shares		3,782,308
Tax benefit of options exercised	821		821
Exercise of employee stock options, net of shares to pay exercie price	1,029	18	1,011
Exercise of employee stock options, net of shares to pay exercise price, shares	506,020	181,125
Note conversion	12,215	65	12,150
Note conversion, shares		652,386
Restricted stock grant canceled (shares)		(7,350)
Restricted stock grant canceled		(1)	1
Amortization of deferred compensation	3,183		3,183
Ending Balance at Dec. 31, 2011	$ (89,030)	$ 7,944	$ 0	$ (80,440)	$ (3,677)	$ (12,857)
Ending Balance, Shares at Dec. 31, 2011		79,441,991