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Quarterly Results of Operations (Unaudited) (Details) (USD $)
Share data in Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Quarterly Results of Operations (Unaudited) [Abstract]                      
Revenue $ 699,748,000 $ 696,482,000 $ 690,810,000 $ 683,045,000 $ 671,971,000 $ 615,728,000 $ 583,299,000 $ 586,920,000 $ 2,770,085,000 $ 2,457,918,000 $ 2,280,535,000
Income from operations 11,955,000 [1] 24,606,000 [1] 18,865,000 [1] 26,860,000 [1] 19,812,000 [1] 29,505,000 [1] 28,863,000 [1] 12,000,000 [1] 82,286,000 90,180,000 65,994,000
Loss before income taxes (25,396,000) (11,132,000) (17,796,000) (9,277,000) (14,622,000) (6,523,000) (21,231,000) (23,459,000) (63,601,000) (65,835,000) (80,333,000)
Net loss (24,487,000) (12,010,000) (18,810,000) (10,338,000) (14,875,000) (7,036,000) (33,959,000) (12,305,000) (65,645,000) (68,175,000) (48,901,000)
Weighted average basic and diluted loss per share (in dollars per share) $ (0.2) $ (0.1) $ (0.15) $ (0.09) $ (0.12) $ (0.06) $ (0.28) $ (0.1) $ (0.54) $ (0.56) $ (0.41)
Weighted average shares used in computing basic and diluted loss per share (in shares) 122,608 122,493 121,708 121,145 120,951 121,616 121,280 120,792      
Non-cash impairment charges included in quarterly results $ 19,300,000   $ 7,200,000 $ 1,100,000 $ 2,000,000     $ 14,800,000      
[1] <div><table cellpadding="0" cellspacing="0" class="DSPFListTable" style="width: 100%; font-family: 'Times New Roman', Times, serif; font-size: 10pt;"><tr><td style="width: 20pt; font-family: 'Times New Roman', serif; color: #000000; font-size: 10pt; vertical-align: top; align: right;">(1)</td><td style="width: auto; font-family: 'Times New Roman', serif; color: #000000; font-size: 10pt; vertical-align: top;">Fourth quarter 2012 and 2011 results include non-cash impairment charges of $19.3 million and $2.0 million, respectively. Second quarter 2012 results include non-cash impairment charges of $7.2 million. First quarter 2012 and 2011 results include non-cash impairment charges of $1.1 million and $14.8 million, respectively.</td></tr></table></div>