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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] | 3 Months Ended
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Mar. 31, 2020 $ / shares shares
RSUs [Member] |  |
Restricted Stock Units Outstanding |  |
Restricted Stock Units Outstanding, Beginning of year | 661,258 |
Restricted Stock Units Outstanding, Granted | 387,274 |
Restricted Stock Units Outstanding, Vested | (178,801) |
Restricted Stock Units Outstanding, Cancelled | (7,561) |
Restricted Stock Units Outstanding, End of year | 862,170 |
Weighted Average Grant Date Fair Value |  |
Weighted Average Grant Date Fair Value, Beginning of year | $ / shares | $ 16.44 |
Weighted Average Grant Date Fair Value, Granted | $ / shares | 8.86 |
Weighted Average Grant Date Fair Value, Vested | $ / shares | 18.72 |
Weighted Average Grant Date Fair Value, Cancelled | $ / shares | 19.41 |
Weighted Average Grant Date Fair Value, End of year | $ / shares | $ 12.53 |
Performance Stock Units (PSUs) [Member] |  |
Restricted Stock Units Outstanding |  |
Restricted Stock Units Outstanding, Beginning of year | 376,328 | [1]
Restricted Stock Units Outstanding, Granted | 387,274 | [1]
Restricted Stock Units Outstanding, Vested | (5,254) | [1]
Restricted Stock Units Outstanding, Cancelled | (32,235) | [1]
Restricted Stock Units Outstanding, End of year | 726,113 | [1]
Weighted Average Grant Date Fair Value |  |
Weighted Average Grant Date Fair Value, Beginning of year | $ / shares | $ 20.65 |
Weighted Average Grant Date Fair Value, Granted | $ / shares | 8.86 |
Weighted Average Grant Date Fair Value, Vested | $ / shares | 28.72 |
Weighted Average Grant Date Fair Value, End of year | $ / shares | $ 13.94 |
[1] | The number of shares for 62,791 of the PSUs listed as outstanding at January 1, 2020 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, 2020 and for all of the PSUs granted in 2020 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. Additionally, 108,957 of the PSUs listed as outstanding at January 1, 2020 represent PSUs granted in March 2018 (the “2018 PSU Awards”). During the first quarter of 2020, the Company’s financial results for the applicable performance goals were certified, with 70.4% of the “target” number of PSUs for the 2018 PSU Awards “earned” based on the Company’s performance, subject to one additional year of time-based vesting. Accordingly, the total number of PSUs granted in the 2018 PSU Awards that are eligible to vest was reduced by 32,235 shares from 108,957 shares to 76,722 shares.

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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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