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CONSOLIDATED STATEMENTS OF EQUITY - USD ($) | Parent | Common Stock | Capital in Excess of Par Value | Cumulative Net Income | Cumulative Distributions | Non-controlling Interests | Total
--- | --- | --- | --- | --- | --- | --- | ---
Balance at beginning of period at Dec. 31, 2017 | $ 755,160,000 | $ 396,000 | $ 856,992,000 | $ 1,100,783,000 | $ (1,203,011,000) | $ 3,488,000 | $ 758,648,000
Balance (in shares) at Dec. 31, 2017 |  | 39,570,000 |  |  |  |  |
Equity activity |  |  |  |  |  |  |
Common stock cash distributions | (22,578,000) |  |  |  | (22,578,000) |  | (22,578,000)
Issuance of restricted stock (in shares) |  | 82,000 |  |  |  |  |
Stock option exercises | 123,000 |  | 123,000 |  |  |  | 123,000
Stock option exercises (in shares) |  | 5,000 |  |  |  |  |
Stock-based compensation expense | 1,376,000 |  | 1,376,000 |  |  |  | 1,376,000
Net income | 20,359,000 |  |  | 20,359,000 |  |  | 20,359,000
Other | (1,065,000) |  | (1,065,000) |  |  |  | (1,065,000)
Other (in shares) |  | (28,000) |  |  |  |  |
Balance at end of period at Mar. 31, 2018 | 753,375,000 | $ 396,000 | 857,426,000 | 1,121,142,000 | (1,225,589,000) | 3,488,000 | 756,863,000
Balance (in shares) at Mar. 31, 2018 |  | 39,629,000 |  |  |  |  |
Balance at beginning of period at Dec. 31, 2017 | 755,160,000 | $ 396,000 | 856,992,000 | 1,100,783,000 | (1,203,011,000) | 3,488,000 | $ 758,648,000
Balance (in shares) at Dec. 31, 2017 |  | 39,570,000 |  |  |  |  |
Equity activity |  |  |  |  |  |  |
Stock option exercises (in shares) |  |  |  |  |  |  | 5,000
Net income |  |  |  |  |  |  | $ 89,295,000
Balance at end of period at Jun. 30, 2018 | 801,127,000 | $ 396,000 | 858,832,000 | 1,190,078,000 | (1,248,179,000) | 4,569,000 | 805,696,000
Balance (in shares) at Jun. 30, 2018 |  | 39,635,000 |  |  |  |  |
Balance at beginning of period at Mar. 31, 2018 | 753,375,000 | $ 396,000 | 857,426,000 | 1,121,142,000 | (1,225,589,000) | 3,488,000 | 756,863,000
Balance (in shares) at Mar. 31, 2018 |  | 39,629,000 |  |  |  |  |
Equity activity |  |  |  |  |  |  |
Common stock cash distributions | (22,590,000) |  |  |  | (22,590,000) |  | (22,590,000)
Issuance of restricted stock | (8,000) |  | (8,000) |  |  |  | (8,000)
Issuance of restricted stock (in shares) |  | 9,000 |  |  |  |  |
Stock-based compensation expense | 1,521,000 |  | 1,521,000 |  |  |  | 1,521,000
Net income | 68,936,000 |  |  | 68,936,000 |  |  | 68,936,000
Non-controlling interests contribution |  |  |  |  |  | 1,081,000 | 1,081,000
Other | (107,000) |  | (107,000) |  |  |  | (107,000)
Other (in shares) |  | (3,000) |  |  |  |  |
Balance at end of period at Jun. 30, 2018 | 801,127,000 | $ 396,000 | 858,832,000 | 1,190,078,000 | (1,248,179,000) | 4,569,000 | 805,696,000
Balance (in shares) at Jun. 30, 2018 |  | 39,635,000 |  |  |  |  |
Equity activity |  |  |  |  |  |  |
Common stock cash distributions | (22,600,000) |  |  |  | (22,600,000) |  | (22,600,000)
Proceeds from common stock issued, net of issuance costs | 929,000 | $ 1,000 | 928,000 |  |  |  | 929,000
Proceeds from common stock issued, net of issuance costs (in shares) |  | 22,000 |  |  |  |  |
Stock-based compensation expense | 1,487,000 |  | 1,487,000 |  |  |  | 1,487,000
Net income | 34,920,000 |  |  | 34,920,000 |  | 17,000 | 34,937,000
Non-controlling interests contribution |  |  |  |  |  | 2,882,000 | 2,882,000
Non-controlling interest distributions |  |  |  |  |  | (17,000) | (17,000)
Other | (21,000) |  | (21,000) |  |  |  | (21,000)
Balance at end of period at Sep. 30, 2018 | 815,842,000 | $ 397,000 | 861,226,000 | 1,224,998,000 | (1,270,779,000) | 7,451,000 | 823,293,000
Balance (in shares) at Sep. 30, 2018 |  | 39,657,000 |  |  |  |  |
Equity activity |  |  |  |  |  |  |
Common stock cash distributions | (22,604,000) |  |  |  | (22,604,000) |  | (22,604,000)
Stock-based compensation expense | 1,486,000 |  | 1,486,000 |  |  |  | 1,486,000
Net income | 30,766,000 |  |  | 30,766,000 |  | 78,000 | 30,844,000
Non-controlling interest distributions |  |  |  |  |  | (48,000) | (48,000)
Balance at end of period at Dec. 31, 2018 | 825,490,000 | $ 397,000 | 862,712,000 | 1,255,764,000 | (1,293,383,000) | 7,481,000 | 832,971,000
Balance (in shares) at Dec. 31, 2018 |  | 39,657,000 |  |  |  |  |
Equity activity |  |  |  |  |  |  |
Cumulative effect of the adoption of the ASC 842 | (42,808,000) |  |  | (42,808,000) |  |  | (42,808,000)
As Adjusted Balance at January 1, 2019 | 782,682,000 | $ 397,000 | 862,712,000 | 1,212,956,000 | (1,293,383,000) | 7,481,000 | 790,163,000
Common stock cash distributions | (22,931,000) |  |  |  | (22,931,000) |  | (22,931,000)
Common stock cash distributions (in shares) |  | 48,000 |  |  |  |  |
Issuance of restricted stock | (1,000) |  | (1,000) |  |  |  | (1,000)
Issuance of restricted stock (in shares) |  | 78,000 |  |  |  |  |
Stock-based compensation expense | 1,689,000 |  | 1,689,000 |  |  |  | 1,689,000
Net income | 20,346,000 |  |  | 20,346,000 |  | 81,000 | 20,427,000
Non-controlling interests contribution |  |  |  |  |  | 919,000 | 919,000
Non-controlling interest distributions |  |  |  |  |  | (89,000) | (89,000)
Other | (2,024,000) |  | (2,024,000) |  |  |  | (2,024,000)
Other (in shares) |  | (44,000) |  |  |  |  |
Balance at end of period at Mar. 31, 2019 | 779,761,000 | $ 397,000 | 862,376,000 | 1,233,302,000 | (1,316,314,000) | 8,392,000 | 788,153,000
Balance (in shares) at Mar. 31, 2019 |  | 39,739,000 |  |  |  |  |
Balance at beginning of period at Dec. 31, 2018 | 825,490,000 | $ 397,000 | 862,712,000 | 1,255,764,000 | (1,293,383,000) | 7,481,000 | 832,971,000
Balance (in shares) at Dec. 31, 2018 |  | 39,657,000 |  |  |  |  |
Equity activity |  |  |  |  |  |  |
Net income |  |  |  |  |  |  | 40,961,000
Balance at end of period at Jun. 30, 2019 | 779,171,000 | $ 397,000 | 863,993,000 | 1,253,748,000 | (1,338,967,000) | 8,439,000 | 787,610,000
Balance (in shares) at Jun. 30, 2019 |  | 39,747,000 |  |  |  |  |
Balance at beginning of period at Mar. 31, 2019 | 779,761,000 | $ 397,000 | 862,376,000 | 1,233,302,000 | (1,316,314,000) | 8,392,000 | 788,153,000
Balance (in shares) at Mar. 31, 2019 |  | 39,739,000 |  |  |  |  |
Equity activity |  |  |  |  |  |  |
Common stock cash distributions | (22,653,000) |  |  |  | (22,653,000) |  | (22,653,000)
Issuance of restricted stock | (6,000) |  | (6,000) |  |  |  | (6,000)
Issuance of restricted stock (in shares) |  | 8,000 |  |  |  |  |
Stock-based compensation expense | 1,623,000 |  | 1,623,000 |  |  |  | 1,623,000
Net income | 20,446,000 |  |  | 20,446,000 |  | 88,000 | 20,534,000
Non-controlling interests contribution |  |  |  |  |  | 46,000 | 46,000
Non-controlling interest distributions |  |  |  |  |  | (87,000) | (87,000)
Balance at end of period at Jun. 30, 2019 | $ 779,171,000 | $ 397,000 | $ 863,993,000 | $ 1,253,748,000 | $ (1,338,967,000) | $ 8,439,000 | $ 787,610,000
Balance (in shares) at Jun. 30, 2019 |  | 39,747,000 |  |  |  |  |

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