CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Comprehensive income, net of tax:
Net income		$ 57,726,000	$ 166,623,000	$ 202,326,000
Other comprehensive income (loss):
Interest rate swaps	[1]	955,000	(9,000)	2,196,000
Capitalized swap interest income (expense)	[2]	30,000	(170,000)	(203,000)
Pension adjustment	[3]	759,000	0	(890,000)
Adoption of ASU 2018-02	[4]	(1,148,000)	0	0
Adoption of ASU 2017-12	[5]	(739,000)	0	0
Terminated swap amortization		(1,018,000)	0	0
Other comprehensive (loss) income		(1,161,000)	(179,000)	1,103,000
Comprehensive income		56,565,000	166,444,000	203,429,000
Comprehensive (income) loss attributable to noncontrolling interests		(714,000)	1,781,000	(23,000)
Comprehensive income attributable to common stockholders		55,851,000	168,225,000	203,406,000
Interest rate swaps, deferred tax expense (benefit)		(300,000)	300,000	1,300,000
Capitalized swap interest income, deferred tax benefit			100,000	100,000
Pension deferred tax (expense) benefit		$ (467,000)	$ 0	$ 543,000

[1] Amounts are shown net of deferred tax benefit of $0.3 million for the years ended December 31, 2018 and 2017 and deferred tax expense of $1.3 million for the year ended December 31, 2016.

[2] The deferred tax impact was not meaningful for the year ended December 31, 2018. Amount is net of deferred tax benefit of $0.1 million for the years ended December 31, 2017 and 2016.

[3] Net of deferred tax expense of $0.5 million for the year ended December 31, 2018 and deferred tax benefit of zero and $0.5 million for the years ended December 31, 2017 and 2016, respectively.

[4] The Company adopted Accounting Standards Update ("ASU") 2018-02, Income Statement-Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income, as of January 1, 2018. See Note 1 - Summary of Significant Accounting Policies for further discussion.

[5] The Company adopted ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities, as of January 1, 2018. See Note 1 - Summary of Significant Accounting Policies for further discussion.