Shareholders' Equity (AOCI by component) (Details) $ in Thousands	12 Months Ended
Dec. 31, 2018 USD ($)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance, Value	$ 5,007,701
Cumulative effect of accounting change (see Note 2)	14,519
Ending balance, Value	5,107,883
Interest rate Swap
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance, Value	23,542
Cumulative effect of accounting change (see Note 2)	2,851
Net current period other comprehensive income	(14,634)
Ending balance, Value	11,759
Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance, Value	128,682
Cumulative effect of accounting change (see Note 2)	(108,374)
Net current period other comprehensive income	(12,644)
Ending balance, Value	7,664
Securities available for sale
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance, Value	109,554
Cumulative effect of accounting change (see Note 2)	(109,554)
Net current period other comprehensive income	0
Ending balance, Value	0
Pro-rata share of non consolidated subsidiaries' OCI
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance, Value	3,769
Cumulative effect of accounting change (see Note 2)	(1,671)
Net current period other comprehensive income	1,155
Ending balance, Value	3,253
Other
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance, Value	(8,183)
Cumulative effect of accounting change (see Note 2)	0
Net current period other comprehensive income	835
Ending balance, Value	$ (7,348)

Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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