Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Condensed Consolidated Balance Sheets
Allowance for doubtful accounts	$ 0	$ 0
Preferred Stock, Par or Stated Value Per Share (in dollars per share)	$ 1.00	$ 1.00
Preferred Stock, Shares Authorized (in shares)	5,000,000	5,000,000
Preferred Stock, Shares Issued (in shares)	0	0
Preferred Stock, Shares Outstanding (is shares)	0	0
Common Stock, Par Value (in dollars per share)	$ 0.01	$ 0.01
Common Stock, Shares Authorized (in shares)	250,000,000	250,000,000
Common Stock, Shares Issued (in shares)	139,877,032	124,023,374
Common Stock, Shares Outstanding (in shares)	139,797,487	123,943,829
Treasury stock, Shares Held (in shares)	79,545	79,545