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Stock-Based Compensation (Summary of Restricted Stock Unit and Stock Option Activity) (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Restricted Stock Units [Member] |  |  |
RSUs Number of Shares |  |  |
Outstanding, beginning of period (in shares) | 1,156,484 | 725,597 | 1,056,597
Granted (in shares) | 1,064,000 | 483,387 | 321,500
Expired or forfeited/cancelled (in shares) | (20,985) |  | (281,560)
Vested/exercised (in shares) | (801,515) | (52,500) | (370,940)
Outstanding, end of period (in shares) | 1,397,984 | 1,156,484 | 725,597
Weighted Average Grant Date Fair Value |  |  |
Outstanding, beginning of period, Weighted Average Grant Date Fair Value (in dollars per share) | $ 22.64 | $ 25.28 | $ 26.54
Granted, Weighted Average Grant Date Fair Value (in dollars per share) | 30.02 | 19.14 | 23.07
Expired or forfeited/cancelled, Weighted Average Grant Date Fair Value (in dollars per share) | 23.91 |  | 23.89
Vested/exercised, Weighted Average Grant Date Fair Value (in dollars per share) | 19.38 | 18.74 | 27.07
Outstanding, end of period, Weighted Average Grant Date Fair Value (in dollars per share) | $ 30.11 | $ 22.64 | $ 25.28
Stock Options [Member] |  |  |
Stock Options Number of Shares |  |  |
Outstanding, beginning of period (in shares) | 2,174,500 | 1,998,000 | 1,989,000
Granted (in shares) | 539,000 | 274,000 | 259,000
Expired or forfeited/cancelled (in shares) | (19,466) |  | (250,000)
Vested/exercised (in shares) | (140,000) | (97,500) |
Outstanding, end of period (in shares) | 2,554,034 | 2,174,500 | 1,998,000
Weighted Average Exercise/(Strike) Price Per Share |  |  |
Outstanding, beginning of period, Weighted Average Exercise/(Strike) Price Per Share (in dollars per share) | $ 19.50 | $ 19.62 | $ 19.63
Granted, Weighted Average Exercise/(Strike) Price Per Share (in dollars per share) | 24.54 | 16.20 | 16.07
Expired or forfeited/cancelled, Weighted Average Exercise/(Strike) Price Per Share (in dollars per share) | 26.56 |  | 15.97
Vested/exercised, Weighted Average Exercise/(Strike) Price Per Share (in dollars per share) | 21.41 | 12.72 |
Outstanding, end of period, Weighted Average Exercise/(Strike) Price Per Share (in dollars per share) | $ 20.45 | $ 19.50 | $ 19.62

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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=96867065&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=96867065&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=96867065&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=96867065&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=96867065&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=96867065&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=96867065&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=96867065&loc=d3e5070-113901 + Details
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