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Unaudited Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total gross revenues | $ 102,169 | $ 97,689 | $ 95,684 | $ 96,099 | $ 95,326 | $ 105,981 | $ 116,912 | $ 111,277 | $ 391,641 | $ 429,496 | $ 430,839
Net income (loss) | 31,448 | 5,596 | 7,365 | 42,220 | 16,929 | (27,612) | 56,680 | 50,453 | 86,629 | 96,450 | 114,891
Net income attributable to common shareholders | $ 29,235 | $ 3,916 | $ 5,519 | $ 40,397 | $ 14,391 | $ (26,975) | $ 53,875 | $ 47,781 | $ 85,583 | $ 95,624 | $ 111,703
Net income attributable to common shareholders - basic (in dollars per share) | $ 0.12 | $ 0.02 | $ 0.02 | $ 0.17 | $ 0.06 | $ (0.12) | $ 0.23 | $ 0.21 | $ 0.33 | $ 0.38 | $ 0.45
Net income (loss) attributable to common shareholders - diluted (usd per share) | $ 0.12 | $ 0.02 | $ 0.02 | $ 0.17 | $ 0.06 | $ (0.12) | $ 0.23 | $ 0.20 | $ 0.33 | $ 0.37 | $ 0.45
LCIF [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total gross revenues | $ 21,604 | $ 21,242 | $ 20,646 | $ 19,281 | $ 18,739 | $ 30,558 | $ 40,772 | $ 34,100 | $ 82,773 | $ 124,169 | $ 128,001
Net income (loss) | $ 8,459 | $ (4,422) | $ (8) | $ (470) | $ 16,877 | $ (61,579) | $ 22,754 | $ 18,027 | $ 3,559 | $ (3,921) | $ 42,315
Net income (loss) (usd per unit) | $ 0.11 | $ (0.05) | $ 0.00 | $ (0.01) | $ 0.20 | $ (0.74) | $ 0.27 | $ 0.22 | $ 0.04 | $ (0.05) | $ 0.58

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