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Equity and Long-Term Incentive Compensation Plans - Equity Incentive Program (Details) $ in Thousands | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 shares | Dec. 31, 2017 USD ($) plan shares | Dec. 31, 2016 USD ($) | Jun. 30, 2016 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of plans | plan |  |  | 2 |  |
Maximum number of shares available for grant (in shares) | [1] | 4,710,000 | 4,137,000 |  |
Total Shares Available for Grant under the Company's equity incentive plans: |  |  |  |  |
Balance as of June 30, 2017 (in shares) | [1] | 4,710,000 |  |  |
Balance as of December 31, 2017 (in shares) | [1] | 4,137,000 |  |  |
Dividends payable | $ |  |  | $ 7,590 | $ 12,763 |
2004 Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares available for issuance (in shares) |  |  | 2,500,000.0 |  |
Percent of fair market value on grant date |  |  | 100.00% |  |
Outside Director Option Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Maximum number of shares available for grant (in shares) |  | 1,700,000 | 1,700,000 |  |
Total Shares Available for Grant under the Company's equity incentive plans: |  |  |  |  |
Balance as of December 31, 2017 (in shares) |  | 1,700,000 |  |  |
Restricted stock units |  |  |  |  |
Total Shares Available for Grant under the Company's equity incentive plans: |  |  |  |  |
Restricted stock units granted (in shares) | [1],[2] | (665,000) |  |  |
Restricted stock units granted, adjustment (in shares) | [1],[3] | 33,000 |  |  |
Restricted stock units canceled (in shares) | [1] | 59,000 |  |  |
Restricted stock units | 2004 Plan |  |  |  |  |
Total Shares Available for Grant under the Company's equity incentive plans: |  |  |  |  |
Restricted stock units granted (in shares) | [4],[5] | (333,000) |  |  |
Restricted stock units granted, adjustment (in shares) | [5],[6] | 17,000 |  |  |
Restricted stock units canceled (in shares) | [5] | 30,000 |  |  |
Restricted stock unit, Performance-based and Service-based |  |  |  |  |
Total Shares Available for Grant under the Company's equity incentive plans: |  |  |  |  |
Dividends payable | $ |  |  | $ 7,600 |  |
Restricted stock unit, Performance-based and Service-based | 2004 Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Maximum number of shares available for grant (in shares) |  | 42,000 | 200,000 |  | 300,000
Total Shares Available for Grant under the Company's equity incentive plans: |  |  |  |  |
Balance as of June 30, 2017 (in shares) |  | 42,000 |  |  |
Balance as of December 31, 2017 (in shares) |  | 200,000 |  |  |
Restricted stock unit, Performance-based and Service-based | Outside Director Option Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Maximum number of shares available for grant (in shares) |  | 300,000 | 300,000 |  |
Total Shares Available for Grant under the Company's equity incentive plans: |  |  |  |  |
Balance as of December 31, 2017 (in shares) |  | 300,000 |  |  |
Awards Granted before November 6, 2013 | 2004 Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Impact on share reserve multiplier |  |  | 1.8 |  |
Awards Granted before November 6, 2013 | Outside Director Option Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Impact on share reserve multiplier |  |  | 1.8 |  |
Awards Granted after November 6, 2013 | 2004 Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Impact on share reserve multiplier |  |  | 2.0 |  |
Awards Granted after November 6, 2013 | Outside Director Option Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Impact on share reserve multiplier |  |  | 2.0 |  |
[1] | The number of restricted stock units reflects the application of the award multiplier as described above (1.8x or 2.0x depending on the grant date of the applicable award).
[2] | Includes restricted stock units granted to senior management during the six months ended December 31, 2017 with performance-based vesting criteria (in addition to service-based vesting criteria for any of such restricted stock units that are deemed to have been earned). As of December 31, 2017, it had not yet been determined the extent to which (if at all) the performance-based vesting criteria had been satisfied. Therefore, this line item includes all such performance-based restricted stock units granted during the six months ended December 31, 2017, reported at the maximum possible number of shares that may ultimately be issuable if all applicable performance-based criteria are achieved at their maximum levels and all applicable service-based criteria are fully satisfied (0.3 million shares for the six months ended December 31, 2017 reflects the application of the multiplier described above).
[3] | Represents the portion of restricted stock units granted with performance-based vesting criteria and reported at the actual number of shares issued upon achievement of the performance vesting criteria during the six months ended December 31, 2017.
[4] | Includes restricted stock units granted to senior management with performance-based vesting criteria (in addition to service-based vesting criteria for any of such restricted stock units that are deemed to have been earned). As of December 31, 2017, it had not yet been determined the extent to which (if at all) the performance-based vesting criteria had been satisfied. Therefore, this line item includes all such performance-based restricted stock units, reported at the maximum possible number of shares (0.3 million shares for the fiscal year ended June 30, 2016, 42 thousand shares for the fiscal year ended June 30, 2017 and 0.2 million shares for the six months ended December 31, 2017) that may ultimately be issuable if all applicable performance-based criteria are achieved at their maximum and all applicable service-based criteria are fully satisfied
[5] | Share numbers reflect actual shares subject to awarded restricted stock units. As described above, under the terms of the 2004 Plan, the number of shares subject to each award reflected in this number is multiplied by either 1.8x or 2.0x (depending on the grant date of the award) to calculate the impact of the award on the share reserve under the 2004 Plan.
[6] | Represents the portion of restricted stock units granted with performance-based vesting criteria and reported at the actual number of shares issued upon achievement of the performance vesting criteria during six months ended December 31, 2017.

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