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Summary of Quarterly Financial Information (unaudited) (Tables)
 12 Months Ended
Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Information The quarterly results of operations of our company for the years ended December 31, 2020, 2019 and 2018 are as follows (amounts in thousands):
March 31, 2020June 30, 2020September 30, 2020December 31, 2020
Revenues$170,224 $141,030 $146,575 $151,399 
Operating income$26,973 $334 $11,928 $19,426 
Net income (loss)$8,288 $(19,618)$(12,269)$710 
Net income (loss) attributable to common stockholders$4,495 $(12,793)$(8,204)$(210)
Net income (loss) per share attributable to common stockholders:
Basic and diluted$0.02 $(0.07)$(0.05)$0.00
March 31, 2019June 30, 2019September 30, 2019December 31, 2019
Revenues$167,293 $176,244 $192,873 $194,933 
Operating income$26,076 $36,239 $45,279 $47,112 
Net income$9,856 $18,930 $26,784 $28,720 
Net income attributable to common stockholders$5,677 $11,087 $15,882 $16,799 
Net income per share attributable to common stockholders:
Basic and diluted $0.03 $0.06 $0.09 $0.09 
March 31, 2018June 30, 2018September 30, 2018December 31, 2018
Revenues$167,271 $178,529 $186,402 $199,309 
Operating income$34,164 $49,665 $48,538 $58,490 
Net income$18,058 $30,184 $29,230 $39,781 
Net income attributable to common stockholders$9,768 $16,651 $16,342 $22,842 
Net income per share attributable to common stockholders:
Basic and diluted $0.06 $0.10 $0.10 $0.13