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Shareholders' Equity and Stock Options (Details 3) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2013 | Dec. 31, 2011
Summary of changes in outstanding restricted common stock units |  |  |
Beginning balance, Total Outstanding, Units | 1,423,611 |  | 1,135,840
Granted, Total Outstanding Units | 484,552 | [1] |
Vested, Total Outstanding Units | 0 |  |
Forfeited, Total Outstanding Units | (24,507) |  |
Distributed, Total Outstanding Units | (220,466) | [2] |
Ending balance, Total Outstanding, Units | 1,663,190 |  | 1,135,840
Beginning balance, Total Outstanding, Weighted Average Grant Date Fair Value per Unit | $ 15.93 |  |
Grant, Total Outstanding, Weighted Average Grant Date Fair Value per Unit | $ 25.13 | [1] |
Vested, Total Outstanding, Weighted Average Grant Date Fair Value per Unit | $ 0 |  |
Forfeited, Total Outstanding, Weighted Average Grant Date Fair Value per Unit | $ 15.62 |  |
Distributed, Total Outstanding, Weighted Average Grant Date Fair Value per Unit | $ 9.87 | [2] |
Ending balance, Total Outstanding, Weighted Average Grant Date Fair Value per Unit | $ 19.41 |  |
Beginning balance, Vested, Units | 311,407 |  |
Vested Units | 282,680 |  |
Granted, Vested, Units | 0 | [1] |
Distributed, Vested, Units | (220,466) | [2] |
Forfeited, Vested, Units | 0 |  |
Ending balance, Vested, Units | 373,621 |  |
Beginning balance, Vested, Weighted Average Grant Date Fair Value per Unit | $ 13.15 |  |
Granted, Weighted Average Grant Date Fair Value per Unit | $ 0 | [1] |
Vested, Weighted Average Grant Date Fair Value per Unit | $ 13.50 |  |
Forfeited, Weighted Average Grant Date Fair Value per Unit | $ 0 |  |
Distributed, Vested, Weighted Average Grant Date Fair Value per Unit | $ 9.87 | [2] |
Ending balance, Vested, Weighted Average Grant Date Fair Value per Unit | $ 15.34 |  |
[1] | Includes dividends reinvested into additional restricted common stock units.
[2] | Includes distributed units which were utilized to satisfy withholding taxes due on the distribution.

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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 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 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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