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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