Preparation of Interim Financial Statements and Other Items - Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands	Jan. 01, 2019	Mar. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets, net		$ 25,110
Short-term operating lease liabilities		6,772
Long-term operating lease liabilities		$ 18,754
Use of lease practical expedient package	true
Use of hindsight in the active lease population	false
ASC 842
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets, net	$ 25,300
Deferred Rent Credit	(500)
Short-term operating lease liabilities	6,200
Long-term operating lease liabilities	$ 19,600