Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Numerator:
Income from continuing operations	$ 16,406	$ 4,858
Net income available for common stockholders	$ 16,043	$ 4,751
Denominator:
Weighted average common shares - basic	420,154	402,781
Earnings per common share - basic (in usd per share)	$ 0.04	$ 0.01
Numerator:
Income from continuing operations	$ 16,406	$ 4,858
Net income available for common stockholders before net income attributable to noncontrolling interests in CPLP	$ 16,330	$ 4,852
Denominator:
Weighted average shares — basic	420,154	402,781
Add:
Potential dilutive common shares - stock options	567	292
Weighted average units of CPLP convertible into common shares	6,974	8,113
Weighted average common shares - diluted	427,695	411,186
Earnings per common share - diluted (in usd per share)	$ 0.04	$ 0.01
Stock Option
Add:
Weighted average anti-dilutive stock options outstanding (in shares)	24	1,499
CPLP
Numerator:
Net income attributable to other noncontrolling interests from continuing operations	$ (287)	$ (101)
Numerator:
Net income attributable to other noncontrolling interests from continuing operations	(287)	(101)
Other Noncontrolling Interests
Numerator:
Net income attributable to other noncontrolling interests from continuing operations	(76)	(6)
Numerator:
Net income attributable to other noncontrolling interests from continuing operations	$ (76)	$ (6)