CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Supplemental disclosures of non-cash investing and financing activities
Common stock issued through the dividend reinvestment plan (in shares)	602	566
Common stock issued through the dividend reinvestment plan	$ 108	$ 96
Number of shares withheld to satisfy employees' tax withholding and other liabilities (in shares)	75,195	67,609
Shares withheld to satisfy employees' tax withholding and other liabilities, value	$ 14,206	$ 10,483
Stock issued during period, shares, share-based compensation, forfeited (in shares)	616
Stock issued during period, value, share-based compensation, forfeited	$ 102	234
Dividends declared but not paid	212,750	203,166
Change in redemption value of redeemable noncontrolling interest	224	63
(Loss) gain on cash flow hedges	(7,231)	11,501
Cash flow hedge losses reclassified to earnings	(1,468)	$ (1,756)
Operating Lease, Right-of-Use Asset	102,312
Total lease liabilities	$ 120,202
Restricted Stock and Restricted Stock Converted From Performance Shares
Supplemental disclosures of non-cash investing and financing activities
Equity instruments granted (in shares)	148,004	182,998
Restricted Stock Converted From Performance Shares
Supplemental disclosures of non-cash investing and financing activities
Equity instruments granted (in shares)	73,072	88,297
Restricted stock
Supplemental disclosures of non-cash investing and financing activities
Equity instruments granted (in shares)	74,932	94,701
Fair value of shares issued	$ 14,666	$ 15,277
Stock issued during period, shares, share-based compensation, forfeited (in shares)	616	1,829
Common stock
Supplemental disclosures of non-cash investing and financing activities
Dividends declared but not paid	$ 212,166
Accumulated earnings less dividends
Supplemental disclosures of non-cash investing and financing activities
Change in redemption value of redeemable noncontrolling interest	$ 224	$ 63