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Summary of RSU and PSU Activity (Details) - 2015 Plan [Member] | 6 Months Ended
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Jun. 30, 2018 $ / shares shares
RSUs |  |
Restricted Stock Units Outstanding |  |
Restricted Stock Units Outstanding, Granted | shares | 241,542 |
Restricted Stock Units Outstanding, Cancelled | shares | (5,386) |
Restricted Stock Units Outstanding, End of year | shares | 236,156 |
Weighted Average Grant Date Fair Value |  |
Weighted Average Grant Date Fair Value, Granted | $ / shares | $ 29.09 |
Weighted Average Grant Date Fair Value, Cancelled | $ / shares | 28.72 |
Weighted Average Grant Date Fair Value, End of year | $ / shares | $ 29.10 |
PSUs |  |
Restricted Stock Units Outstanding |  |
Restricted Stock Units Outstanding, Beginning of year | shares | 62,791 | [1]
Restricted Stock Units Outstanding, Granted | shares | 108,957 | [1]
Restricted Stock Units Outstanding, End of year | shares | 171,748 | [1]
Weighted Average Grant Date Fair Value |  |
Weighted Average Grant Date Fair Value, Beginning of year | $ / shares | $ 27.87 |
Weighted Average Grant Date Fair Value, Granted | $ / shares | 28.72 |
Weighted Average Grant Date Fair Value, End of year | $ / shares | $ 28.41 |
[1] | The number of Shares listed for PSUs represents the “target” number of PSUs granted to each recipient eligible to vest if the Company meets its “target” performance goals for the applicable period. The actual number of PSUs eligible to vest will vary depending on whether or not the Company meets or exceeds the applicable threshold, target or maximum performance goals for the PSUs. With respect to 108,957 of the listed “target” number of PSUs, 200% of the “target” number of PSUs will be eligible to vest at “maximum” performance levels.

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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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&loc=d3e5070-113901 + Details
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