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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] | The following table summarizes activity related to our RSUs under the Equity Incentive Plan for the three months ended March 31, 2015:
| Number Outstanding |  | Weighted Average Grant Date Fair Value |  | Aggregate Intrinsic Value (in thousands) (1)
Unvested as of January 1, 2015 | 2,151,232 |  |  | $ | 20.97 |  |  | $ | 60,493 |
Granted | 869,893 |  |  | $ | 27.00 |  |  |
Vested | (471,050 | ) |  | $ | 19.54 |  |  |
Forfeited / Canceled | (15,666 | ) |  | $ | 23.61 |  |  |
Unvested as of March 31, 2015 | 2,534,409 |  |  | $ | 23.29 |  |  | $ | 64,780 |
Expected to vest after March 31, 2015 | 2,436,315 |  |  | $ | 23.12 |  |  | $ | 62,272 |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] | The following table summarizes activity related to our stock options under the Equity Incentive Plan for the three months ended March 31, 2015:
| Number Outstanding |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value (in thousands) (1)
Balance as of January 1, 2015 | 5,207,772 |  |  | $ | 8.04 |  |  | 3.6 |  | $ | 105,038 |
Exercised | (462,025 | ) |  | $ | 4.36 |  |  |  |  |  |
Forfeited / Canceled | (6,109 | ) |  | $ | 32.31 |  |  |  |  |  |
Balance as of March 31, 2015 | 4,739,638 |  |  | $ | 8.36 |  |  | 3.5 |  | $ | 82,180 |
Exercisable as of March 31, 2015 | 4,637,000 |  |  | $ | 7.85 |  |  | 3.4 |  | $ | 82,134 |
Exercisable as of March 31, 2015 and expected to vest thereafter | 4,729,661 |  |  | $ | 8.31 |  |  | 3.5 |  | $ | 82,180 |
Schedule Of Pre-Tax Stock-Based Compensation Expense | The following table summarizes the components of pre-tax stock-based compensation expense (in thousands):
| Three Months Ended
| March 31,
| 2015 |  | 2014
RSUs | $ | 5,420 |  |  | $ | 5,396 |
Stock options | 126 |  |  | 804 |
Restricted stock | — |  |  | 46 |
Total stock-based compensation expense | $ | 5,546 |  |  | $ | 6,246 |

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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