Consolidated Statements of Stockholders' Equity Consolidated Statements of Stockholders' Equity Parenthetical (Details)
$ in Thousands
|12 Months Ended|
Dec. 31, 2018
|Statement of Stockholders' Equity [Abstract]|
|Offering costs||$ 16,949|
Amount of decrease in additional paid in capital (APIC) resulting from direct costs associated with issuing stock. Includes, but is not limited to, legal and accounting fees and direct costs associated with stock issues under a shelf registration.
Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef