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Commitments and Contingencies - Settlement and Royalty Indemnity, Narrative (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Nov. 30, 2011 | Aug. 31, 2011 | Jun. 30, 2017 | Mar. 31, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Net income |  |  | $ 6,408,000 |  | $ 7,860,000 | $ 15,096,000 | $ 12,236,000 | $ 97,700,000
Letters of credit |  |  | 5,000,000 |  |  | 5,000,000 |  | 9,005,000
Reduction to royalty award accrual |  |  | 500,000 | $ 2,900,000 |  |  |  |
Settlement and royalty indemnification |  |  | 4,327,000 |  |  | 4,327,000 |  | 5,656,000
Settlement and royalty indemnification, long-term |  |  | $ 1,076,000 |  |  | $ 1,076,000 |  | $ 5,382,000
Norit Litigation |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Period of payment for equity award after each quarter till 2018 |  | 3 months |  |  |  |  |  |
Ability to pay dividends, percent of market fair value | 50.00% |  |  |  |  |  |  |
Benchmark for earnings for increase in letters of credit | $ 20,000,000.0 |  |  |  |  |  |  |
Increase in letters of credit as collateral | $ 5,000,000 |  |  |  |  |  |  |

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