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Stock-Based Compensation (Details) (USD $) | 12 Months Ended |  | 0 Months Ended |  | 0 Months Ended
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Dec. 31, 2013 | Dec. 31, 2013 Stock options | Dec. 31, 2012 Stock options | Dec. 31, 2011 Stock options | Dec. 31, 2013 Stock options Minimum | Dec. 31, 2013 Stock options Maximum | Jun. 01, 2003 2003 Plan | Jun. 01, 2003 2003 Plan Incentive stock options | Jun. 01, 2003 2003 Plan Nonqualified stock options | Jun. 09, 2011 2008 Plan | Dec. 31, 2013 2008 Plan | Jun. 09, 2011 2008 Plan Stock options | Jun. 09, 2011 2008 Plan Stock appreciation rights | Jun. 09, 2011 2008 Plan Restricted stock and Other full value stock awards
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares of common stock available for awards |  |  |  |  |  |  | 12,000,000 |  |  | 9,250,000 |  |  |  |
Increase in number of shares of common stock available for awards |  |  |  |  |  |  |  |  |  | 2,350,000 |  |  |  |
Exercise price per share as a percentage of the fair market value of the Common Stock |  |  |  |  |  |  |  | 100.00% | 85.00% |  |  |  |  |
Number of shares of common stock counted against the maximum shares available for grant for each share awarded under the plan |  |  |  |  |  |  |  |  |  |  |  | 1 | 1 | 2.44
Options available for future grants (in shares) |  |  |  |  |  |  |  |  |  |  | 872,105 |  |  |
Exercise price of options granted, low end of range (in dollars per share) | $ 2.83 | $ 2.83 |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of options granted, high end of range (in dollars per share) | $ 14.41 | $ 14.41 |  |  |  |  |  |  |  |  |  |  |  |
Contractual lives of options granted |  |  |  |  | 7 years | 10 years |  |  |  |  |  |  |  |
Number of Option Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at the beginning of the period (in shares) |  | 11,805,688 |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
Exercised (in shares) |  | (2,452,865) |  |  |  |  |  |  |  |  |  |  |  |
Exchanged (in shares) |  | (2,022,985) |  |  |  |  |  |  |  |  |  |  |  |
Canceled (in shares) |  | (13,125) |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at the end of the period (in shares) |  | 7,316,713 | 11,805,688 |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Exercise Price |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at the beginning of the period (in dollars per share) |  | $ 7.33 |  |  |  |  |  |  |  |  |  |  |  |
Exercised (in dollars per share) |  | $ 6.95 |  |  |  |  |  |  |  |  |  |  |  |
Exchanged (in dollars per share) |  | $ 7.14 |  |  |  |  |  |  |  |  |  |  |  |
Canceled (in dollars per share) |  | $ 6.64 |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at the end of the period (in dollars per share) |  | $ 7.51 | $ 7.33 |  |  |  |  |  |  |  |  |  |  |
Additional disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Remaining Contractual Term |  | 3 years 4 months 6 days |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Intrinsic Value (in dollars) |  | $ 52,052,000 |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average grant-date fair value of options granted (in dollars per share) |  |  | $ 17.19 | $ 16.68 |  |  |  |  |  |  |  |  |  |
Aggregate intrinsic value of stock options exercised (in dollars) |  | 46,000,000 | 23,200,000 | 9,500,000 |  |  |  |  |  |  |  |  |  |
Number of Option Shares |  | 5,331,652 |  |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Exercise Price (in dollars per share) |  | $ 7.24 |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average remaining contractual term |  | 2 years 11 months 23 days |  |  |  |  |  |  |  |  |  |  |  |
Aggregate intrinsic value (in dollars) |  | $ 39,300,000 |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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