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Stock Option Plans and Share-Based Compensation Restricted Stock Awards and RSUs rollforward (Details) (USD $) |  |  |  |  | 12 Months Ended |
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2013 Restricted Stock [Member] | Dec. 31, 2012 Restricted Stock [Member] | Dec. 31, 2011 Restricted Stock [Member] | Dec. 31, 2013 Restricted Stock Units (RSUs) [Member] | Dec. 31, 2012 Restricted Stock Units (RSUs) [Member] | Dec. 31, 2011 Restricted Stock Units (RSUs) [Member] | Dec. 31, 2013 Range Two [Member] | Dec. 31, 2013 Range Three [Member] | Dec. 31, 2013 Range Four [Member] | Dec. 31, 2013 Range Five [Member] | Dec. 31, 2013 Range Six [Member] | Dec. 31, 2013 Range Seven [Member] | Dec. 31, 2013 Range Eight [Member] | Dec. 31, 2013 Range Nine [Member] | Dec. 31, 2013 Range Ten [Member] | Dec. 31, 2013 Range One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | 3,143,000 | 4,470,000 | 4,693,000 | 4,740,000 |  |  |  |  |  |  | 384,000 | 347,000 | 358,000 | 364,000 | 382,000 | 434,000 | 330,000 | 136,000 | 76,000 | 332,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price | $ 15.82 | $ 14.06 | $ 13.36 | $ 12.86 |  |  |  |  |  |  | $ 10.65 | $ 12.84 | $ 13.86 | $ 14.58 | $ 16.79 | $ 19.84 | $ 22.52 | $ 24.61 | $ 29.16 | $ 8.71
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | 2,078,000 |  |  |  |  |  |  |  |  |  | 384,000 | 291,000 | 143,000 | 167,000 | 106,000 | 369,000 | 104,000 | 106,000 | 76,000 | 332,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price | $ 15.11 |  |  |  |  |  |  |  |  |  | $ 10.65 | $ 12.77 | $ 13.94 | $ 14.67 | $ 16.51 | $ 20.12 | $ 21.50 | $ 24.76 | $ 29.16 | $ 8.71
Number of shares [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  |  | 58,000 | 68,000 | 77,000 | 389,000 | 287,000 | 308,000 |  |  |  |  |  |  |  |  |  |
Granted |  |  |  |  | 55,000 | 67,000 | 68,000 | 190,000 | 274,000 | 145,000 |  |  |  |  |  |  |  |  |  |
Vested |  |  |  |  | (61,000) | (78,000) | (77,000) | (195,000) | (153,000) | (152,000) |  |  |  |  |  |  |  |  |  |
Forfeited |  |  |  |  |  |  |  | 22,000 | (19,000) | (14,000) |  |  |  |  |  |  |  |  |  |
Ending balance |  |  |  |  | 52,000 | 58,000 | 68,000 | 362,000 | 389,000 | 287,000 |  |  |  |  |  |  |  |  |  |
Weighted-average grant date fair value per share [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  |  | $ 14.19 | $ 14.71 | $ 12.91 | $ 14.09 | $ 13.03 | $ 12.98 |  |  |  |  |  |  |  |  |  |
Granted |  |  |  |  | $ 18.20 | $ 14.19 | $ 14.71 | $ 19.87 | $ 14.58 | $ 14.39 |  |  |  |  |  |  |  |  |  |
Vested |  |  |  |  | $ 14.23 | $ 14.64 | $ 12.91 | $ 14.31 | $ 12.90 | $ 14.26 |  |  |  |  |  |  |  |  |  |
Forfeited |  |  |  |  |  |  |  | $ 14.08 | $ 14.55 | $ 12.82 |  |  |  |  |  |  |  |  |  |
Ending balance |  |  |  |  | $ 18.43 | $ 14.19 | $ 14.71 | $ 17.15 | $ 14.09 | $ 13.03 |  |  |  |  |  |  |  |  |  |
Vested in period, fair value |  |  |  |  | $ 1,126,670.00 | $ 1,100,000.00 | $ 1,100,000.00 | $ 4,400,000 | $ 2,300,000 | $ 2,400,000 |  |  |  |  |  |  |  |  |  |
Compensation cost not yet recognized |  |  |  |  | $ 400,000 |  |  | $ 5,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Period for recognition |  |  |  |  | 2 years |  |  | 2 years 6 months |  |  |  |  |  |  |  |  |  |  |  |

X
- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + References No definition available. + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting 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)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(iii)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting 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)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + 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)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + 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)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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