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MAALP Capital - Summary of Changes in Total Capital and its Components (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Increase (Decrease) in Partners' Capital [Roll Forward] |  |  |  |
Beginning Balance | $ 6,325,280 | $ 6,520,344 | $ 6,372,170 | $ 6,573,875
Net Income Available for Common Unitholders | 64,141 | 61,981 | 130,099 | 112,801
Other comprehensive (loss) income - derivatives instruments (cash flow hedges) | (6,004) | 5,165 | (9,205) | 5,804
Issuance of units | (519) | (341) | 610 | (236)
Units repurchased and retired | (701) |  | (3,724) | (2,912)
Units Issued During Period, Value, Unit Options Exercised | 1,032 |  | 1,240 | 625
Units issued in exchange for redeemable units | 575 |  | 575 | 1,915
Redeemable stock fair market value | (835) | (892) | (2,186) | 73
Amortization of unearned compensation | 3,452 | 2,963 | 8,237 | 6,987
Dividends, Preferred Stock, Cash | (922) | (922) | (1,844) | (1,844)
Distributions | (113,482) | (108,837) | (226,815) | (217,627)
Contribution from noncontrolling interest | 490 |  | 3,350 |
Ending Balance | 6,272,507 | 6,479,461 | 6,272,507 | 6,479,461
Limited Partner [Member] |  |  |  |
Increase (Decrease) in Partners' Capital [Roll Forward] |  |  |  |
Beginning Balance | 218,011 | 226,815 | 220,043 | 231,676
Net income | 2,224 | 2,174 | 4,522 | 3,975
General partnership units issued in exchange for limited partnership units | (821) | (338) | (1,157) | (3,118)
Adjustment for limited partners' capital at redemption value | (85) | (24) | (138) | (87)
Distributions | (3,925) | (3,814) | (7,866) | (7,633)
Ending Balance | 215,404 | 224,813 | 215,404 | 224,813
General Partners' Capital Account [Member] |  |  |  |
Increase (Decrease) in Partners' Capital [Roll Forward] |  |  |  |
Beginning Balance | 6,038,625 | 6,221,216 | 6,083,142 | 6,270,758
Net Income Allocated to General Partners | 60,995 | 58,885 | 123,733 | 106,982
Issuance of units | (519) | (341) | 610 | (236)
Units repurchased and retired | (701) |  | (3,724) | (2,912)
Units Issued During Period, Value, Unit Options Exercised | 1,032 |  | 1,240 | 625
General partnership units issued in exchange for limited partnership units | 821 | 338 | 1,157 | 3,118
Units issued in exchange for redeemable units | 575 |  | 575 | 1,915
Redeemable stock fair market value | (835) | (892) | (2,186) | 73
Adjustment for limited partners' capital at redemption value | 85 | 24 | 138 | 87
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification |  |  |  | (233)
Amortization of unearned compensation | 3,452 | 2,963 | 8,237 | 6,987
Distributions | (109,557) | (105,023) | (218,949) | (209,994)
Ending Balance | 5,993,973 | 6,177,170 | 5,993,973 | 6,177,170
Accumulated Distributions in Excess of Net Income [Member] |  |  |  |
Increase (Decrease) in Partners' Capital [Roll Forward] |  |  |  |
Beginning Balance | 66,840 | 66,840 | 66,840 | 66,840
Net income | 922 | 922 | 1,844 | 1,844
Redeemable stock fair market value | (835) | (892) | (2,186) | 73
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification |  |  |  | (233)
Dividends, Preferred Stock, Cash | (922) | (922) | (1,844) | (1,844)
Ending Balance | 66,840 | 66,840 | 66,840 | 66,840
AOCI Attributable to Noncontrolling Interest [Member] |  |  |  |
Increase (Decrease) in Partners' Capital [Roll Forward] |  |  |  |
Beginning Balance | (3,362) | 3,167 | (161) | 2,295
Other comprehensive (loss) income - derivatives instruments (cash flow hedges) | (6,004) | 5,165 | (9,205) | 5,804
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification |  |  |  | 233
Ending Balance | (9,366) | 8,332 | (9,366) | 8,332
Noncontrolling Interest |  |  |  |
Increase (Decrease) in Partners' Capital [Roll Forward] |  |  |  |
Beginning Balance | 5,166 | 2,306 | 2,306 | 2,306
Contribution from noncontrolling interest | 490 |  | 3,350 |
Ending Balance | $ 5,656 | $ 2,306 | $ 5,656 | $ 2,306

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