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Summary of Significant Accounting Policies Level 4 Revisions to Prior Period Financial Statements (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |  | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Mar. 31, 2013 As Reported [Member] | Jun. 30, 2013 As Reported [Member] | Sep. 30, 2013 As Reported [Member] | Dec. 31, 2012 As Reported [Member] | Dec. 31, 2011 As Reported [Member] | Mar. 31, 2013 As Revised [Member] | Jun. 30, 2013 As Revised [Member] | Sep. 30, 2013 As Revised [Member] | Dec. 31, 2012 As Revised [Member] | Dec. 31, 2011 As Revised [Member]
Cash and cash equivalents | $ 118,249 | $ 45,893 | $ 176,369 | $ 259,135 | $ 233,547 | $ 232,667 | $ 157,019 | $ 54,507 |  | $ 221,232 | $ 223,881 | $ 144,216 | $ 45,893 |
Total current assets | 687,705 | 518,843 |  |  | 857,862 | 845,385 | 769,568 | 527,457 |  | 845,547 | 836,599 | 756,765 | 518,843 |
Total assets | 1,104,186 | 827,784 | 896,700 |  | 1,209,797 | 1,194,615 | 1,217,959 | 836,398 |  | 1,197,482 | 1,185,829 | 1,205,156 | 827,784 |
Accounts payable |  |  |  |  | 218,480 | 197,163 | 193,772 | 142,142 |  | 206,165 | 188,377 | 180,969 | 133,528 |
Total current liabilities | 239,017 | 227,573 |  |  | 301,111 | 272,822 | 301,815 | 236,187 |  | 288,796 | 264,036 | 289,012 | 227,573 |
Total liabilities and stockholders' equity | 1,104,186 | 827,784 |  |  | 1,209,797 | 1,194,615 | 1,217,959 | 836,398 |  | 1,197,482 | 1,185,829 | 1,205,156 | 827,784 |
Net cash provided by (used for) operations | $ 33,427 | $ 77,608 | $ (43,601) |  | $ (53,742) | $ (45,823) | $ 22,077 | $ 80,136 | $ (42,981) | $ (57,443) | $ (45,995) | $ 17,888 | $ 77,608 | $ (43,601)

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