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Stock-based compensation (Tables) | 6 Months Ended
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Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of compensation cost | Following is a summary of stock-based compensation expense related to stock options and restricted stock awards for the three and six months ended March 31, 2019 and March 31, 2018, respectively.
| Three Months Ended |  | Six Months Ended
| March 31, |  | March 31,
in thousands | 2019 |  | 2018 |  | 2019 |  | 2018
Stock-based compensation expense | $ | 2,180 |  |  | $ | 2,598 |  |  | $ | 4,294 |  |  | $ | 5,208 |
Schedule of stock options and SSARs outstanding | Following is a summary of stock option activity for the six months ended March 31, 2019:
| Six Months Ended
| March 31, 2019
| Shares |  | Weighted Average Exercise Price
Outstanding at beginning of period | 533,052 |  |  | $ | 14.26 |
Granted | 25,230 |  |  | 10.38 |
Exercised | (26,650 | ) |  | 10.44 |
Cancelled | (2,319 | ) |  | 9.81 |
Outstanding at end of period | 529,313 |  |  | $ | 14.29 |
Exercisable at end of period | 478,064 |  |  | $ | 14.33 |
Vested or expected to vest in the future | 526,534 |  |  | $ | 14.31 |
Schedule of nonvested stock awards activity | Following is a summary of restricted stock activity for the six months ended March 31, 2019:
| Six Months Ended March 31,
| Performance-Based Restricted Shares |  | Time-Based Restricted Shares |  | Total Restricted Shares
Beginning of period | 644,785 |  |  | 431,783 |  |  | 1,076,568 |
Granted (a) | 467,819 |  |  | 441,991 |  |  | 909,810 |
Vested (a) | (309,843 | ) |  | (204,977 | ) |  | (514,820 | )
Forfeited | (7,020 | ) |  | (23,647 | ) |  | (30,667 | )
End of period | 795,741 |  |  | 645,150 |  |  | 1,440,891 |
(a) Grant and vesting activity during the six months ended March 31, 2019 include 86,050 shares that were issued above target based on the performance level achieved under performance-based restricted stock vesting in the current period.

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested performance-based 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) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock options and stock appreciation rights that were outstanding at the beginning and end of the year, exercisable at the end of the year, and the number of stock options and stock appreciation rights that were granted, exercised or converted, forfeited, and expired during the year. + 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) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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