Preparation of Interim Financial Statements and Other Items - Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands	Jan. 01, 2019	Sep. 30, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets, net		$ 26,537
Short-term operating lease liabilities		6,739
Long-term operating lease liabilities		$ 20,232
ASU 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounting Standards Update adopted	true
ASU method of adoption	Modified Retrospective
Operating lease right-of-use assets, net	$ 25,300
Deferred rent	(500)
Short-term operating lease liabilities	6,200
Long-term operating lease liabilities	$ 19,600
Use of lease practical expedient package	true
Use of hindsight in the active lease population	false
Cumulative effect adjustment to retained earnings	$ 0
ASU 2018-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounting Standards Update adopted	true
ASU adopted - effect of adoption	$ 0