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Stock Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2014
Share-based Compensation [Abstract] |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value [Table Text Block] | the following assumptions and weighted average fair values:
|  | December 31,
|  | 2012
Weighted average fair value of grants |  | $ | 14.58 |
Risk-free interest rate |  | 0.73 | %
Expected dividend yield |  | 1.18 | %
Expected forfeiture rate |  | 2.00 | %
Expected volatility |  | 54.80 | %
Expected term in years |  | 4.40 |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] | A summary of the status of stock options granted is presented below:
|  |  |  |  |  | Weighted |  |
|  |  |  |  |  | Average |  |
|  |  |  | Weighted |  | Remaining |  | Aggregate
|  |  |  | Average |  | Contractual |  | Intrinsic
|  |  |  | Exercise |  | Term (in |  | Value (in
|  | Shares |  | Price |  | years) |  | thousands)
Balance at December 31, 2013 |  | 4,777,226 |  |  | $ | 38.12 |  |  |  |  |
Granted |  | — |  |  | $ | — |  |  |  |  |
Exercised |  | (725,027 | ) |  | $ | 20.70 |  |  |  |  |
Forfeited |  | (9,170 | ) |  | $ | 36.89 |  |  |  |  |
Balance at December 31, 2014 |  | 4,043,029 |  |  | $ | 41.24 |  |  | 3.72 |  |  | $ | 37,900 |
Vested and expected to vest |  | 4,032,198 |  |  | $ | 41.26 |  |  | 3.71 |  |  | $ | 37,900 |
Exercisable at December 31, 2014 |  | 3,896,403 |  |  | $ | 41.43 |  |  | 3.60 |  |  | $ | 37,529 |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
|  | Number of |  | Weighted Average
|  | Shares |  | Grant Date Fair Value
Nonvested at December 31, 2013 |  | 881,570 |  |  | $35.95
Granted |  | 833,390 |  |  | $37.63
Vested |  | (425,107 | ) |  | $36.90
Forfeited |  | (41,662 | ) |  | $35.71
Nonvested at December 31, 2014 |  | 1,248,191 |  |  | $36.76
Schedule of Nonvested Performance-based Units Activity [Table Text Block] | he following represents the nonvested performance share units and their corresponding fair value (based upon the closing share price) on the date of grant:
|  | Number of |  | Weighted Average
|  | Shares |  | Grant Date Fair Value
Nonvested at December 31, 2013 |  | 583,480 |  |  | $38.19
Granted |  | 276,098 |  |  | $42.93
Vested |  | (378,971 | ) |  | $49.50
Nonvested at December 31, 2014 |  | 480,607 |  |  | $31.99
Schedule of Other Share-based Compensation, Activity [Table Text Block] | he following represents their corresponding fair value (based upon the closing share price) at the date of grant:
|  | Number of |  | Weighted Average
|  | Shares |  | Grant Date Fair Value
Nonvested at December 31, 2013 |  | 301,063 |  |  | $16.44
Vested |  | (301,063 | ) |  | $16.44
Nonvested at December 31, 2014 |  | — |  |  | $16.44

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- Definition Tabular disclosure of the changes in outstanding nonvested performance-based 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 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 changes in other outstanding share-based compensation awards other than stock options or nonvested awards. + 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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- Definition Tabular disclosure of the weighted-average grant-date fair value of equity options or other equity instruments granted 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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