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Summary of Activity Related To Time-based Restricted Stock Units (RSUs) and Performance-based Restricted Stock Units (PSUs) (Details) - 2015 Plan [Member] | 9 Months Ended
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Sep. 30, 2019 $ / shares shares
RSUs |  |
Restricted Stock Units Outstanding |  |
Restricted Stock Units Outstanding, Beginning of year | 232,299 |
Restricted Stock Units Outstanding, Granted | 561,606 |
Restricted Stock Units Outstanding, Vested | (102,218) |
Restricted Stock Units Outstanding, Cancelled | (20,899) |
Restricted Stock Units Outstanding, End of year | 670,788 |
Weighted Average Grant Date Fair Value |  |
Weighted Average Grant Date Fair Value, Beginning of year | $ / shares | $ 29.10 |
Weighted Average Grant Date Fair Value, Granted | $ / shares | 13.94 |
Weighted Average Grant Date Fair Value, Vested | $ / shares | 29.59 |
Weighted Average Grant Date Fair Value, Cancelled | $ / shares | 22.69 |
Weighted Average Grant Date Fair Value, End of year | $ / shares | $ 16.53 |
Performance Stock Units (PSUs) [Member] |  |
Restricted Stock Units Outstanding |  |
Restricted Stock Units Outstanding, Beginning of year | 171,748 | [1]
Restricted Stock Units Outstanding, Granted | 204,580 | [1]
Restricted Stock Units Outstanding, End of year | 376,328 | [1]
Weighted Average Grant Date Fair Value |  |
Weighted Average Grant Date Fair Value, Beginning of year | $ / shares | $ 28.41 |
Weighted Average Grant Date Fair Value, Granted | $ / shares | 14.13 |
Weighted Average Grant Date Fair Value, End of year | $ / shares | $ 20.65 |
Actual number of PSUs granted to each recipient, eligible to vest | 62,791 |
Percentage of target number of PSU's eligible to vest at "maximum" performance level | 200.00% |
[1] | The number of shares for 62,791 of the PSUs listed as outstanding at January 1, 2019 represents the actual number of PSUs granted to each recipient eligible to vest if the Company meets its performance goals for the applicable period. The number of shares for the remainder of the PSUs listed as outstanding at January 1, 2019 and for all of the PSUs granted in 2019 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 for those PSUs will vary depending on whether or not the Company meets or exceeds the applicable threshold, target or maximum performance goals for the PSUs, with 200% of the “target” number of PSUs eligible to vest at “maximum” performance levels.

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- Definition Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period, eligible to vest upon condition. + References No definition available. + Details
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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=116856206&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=116856206&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=116856206&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=116856206&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=116856206&loc=d3e5070-113901 + Details
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