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Stock-Based Compensation (Summary of Restricted Stock Unit and Stock Option Activity) (Details) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Restricted Stock Units [Member] |  |  |
RSUs Number of Shares |  |  |
Outstanding, beginning of period (in shares) | 1,056,597 | 361,668 | 1,141,666
Granted (in shares) | 321,500 | 996,597 | 246,668
Expired or canceled (in shares) | (281,560) | (20,000) | (176,667)
Vested/exercised (in shares) | (370,940) | (281,668) | (849,999)
Outstanding, end of period (in shares) | 725,597 | 1,056,597 | 361,668
Weighted Average Grant Date Fair Value |  |  |
Outstanding, beginning of period, Weighted Average Grant Date Fair Value (in dollars per share) | $ 26.54 | $ 17.30 | $ 18.12
Granted, Weighted Average Grant Date Fair Value (in dollars per share) | 23.07 | 27.10 | 19.87
Expired or canceled, Weighted Average Grant Date Fair Value (in dollars per share) | 23.89 | 24.77 | 13.66
Vested/exercised, Weighted Average Grant Date Fair Value (in dollars per share) | 27.07 | 16.76 | 19.91
Outstanding, end of period, Weighted Average Grant Date Fair Value (in dollars per share) | $ 25.28 | $ 26.54 | $ 17.30
Stock Options [Member] |  |  |
Stock Options Number of Shares |  |  |
Outstanding, beginning of period (in shares) | 1,989,000 | 1,295,000 | 1,315,465
Granted (in shares) | 259,000 | 714,000 | 200,000
Expired or canceled (in shares) | (250,000) |  | (140,000)
Vested/exercised (in shares) |  | (20,000) | (80,465)
Outstanding, end of period (in shares) | 1,998,000 | 1,989,000 | 1,295,000
Weighted-Average Grant Date Fair Value |  |  |
Outstanding, beginning of period, Grant Date Fair Value (in dollars per share) | $ 19.63 | $ 20.20 | $ 18.91
Granted, Grant Date Fair Value (in dollars per share) | 16.07 | 18.40 | 20.80
Expired or canceled, Grant Date Fair Value (in dollars per share) | 15.97 |  | 13.04
Vested/exercised, Grant Date Fair Value (in dollars per share) |  | 12.54 | 13.16
Outstanding, end of period, Grant Date Fair Value (in dollars per share) | $ 19.62 | $ 19.63 | $ 20.20

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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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