Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Numerator:
Income from continuing operations	$ 21,749	$ 170,945	$ 38,155	$ 175,803
Net income available for common stockholders	$ 21,276	$ 168,089	$ 37,319	$ 172,840
Denominator:
Weighted average common shares - basic (in shares)	420,294	419,402	420,225	411,137
Earnings per common share - basic (in usd per share)	$ 0.05	$ 0.40	$ 0.09	$ 0.42
Numerator:
Income from continuing operations	$ 21,749	$ 170,945	$ 38,155	$ 175,803
Net income available for common stockholders before net income attributable to noncontrolling interests in CPLP	$ 21,686	$ 170,945	$ 38,016	$ 175,797
Denominator:
Weighted average shares — basic (in shares)	420,294	419,402	420,225	411,137
Add:
Potential dilutive common shares - stock options (in shares)	233	320	245	306
Weighted average units of CPLP convertible into common shares (in shares)	6,974	7,458	6,974	7,784
Weighted average common shares - diluted (in shares)	427,501	427,180	427,444	419,227
Earnings per common share - diluted (in usd per share)	$ 0.05	$ 0.40	$ 0.09	$ 0.42
Stock Option
Add:
Weighted average anti-dilutive stock options outstanding (in shares)	0	731	12	744
CPLP
Numerator:
Net income attributable to other noncontrolling interests from continuing operations	$ (410)	$ (2,856)	$ (697)	$ (2,957)
Numerator:
Net income attributable to other noncontrolling interests from continuing operations	(410)	(2,856)	(697)	(2,957)
Other Noncontrolling Interests
Numerator:
Net income attributable to other noncontrolling interests from continuing operations	(63)	0	(139)	(6)
Numerator:
Net income attributable to other noncontrolling interests from continuing operations	$ (63)	$ 0	$ (139)	$ (6)