Earnings Per Share (Computation of Basic and Diluted Earnings per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Numerator:
Income from continuing operations	$ 219,959	$ 60,941	$ 94,332
Income from continuing operations available for common stockholders	216,275	59,946	94,221
Income from discontinued operations	0	19,163	31,297
Net income available for common stockholders	$ 216,275	$ 79,109	$ 125,518
Denominator:
Weighted average common shares - basic (in shares)	415,610	253,895	215,827
Income from continuing operations available for common stockholders (in usd per share)	$ 0.52	$ 0.24	$ 0.44
Income from discontinued operations available for common stockholders (in usd per share)	0.00	0.07	0.14
Net income available to common stockholders (in usd per share)	$ 0.52	$ 0.31	$ 0.58
Numerator:
Income from continuing operations	$ 219,959	$ 60,941	$ 94,332
Income from continuing operations available for common stockholders	219,956	60,730	94,221
Income from discontinued operations	0	19,163	31,297
Net income available for common stockholders before net income attributable to noncontrolling interests in CPLP	$ 219,956	$ 79,893	$ 125,518
Denominator:
Weighted average common shares - basic (in shares)	415,610	253,895	215,827
Add:
Potential dilutive common shares - stock options (in shares)	312	178	152
Weighted average units of CPLP convertible into common shares (in shares)	7,375	1,950	0
Weighted average common shares - diluted (in shares)	423,297	256,023	215,979
Income from continuing operations available for common stockholders (in usd per share)	$ 0.52	$ 0.24	$ 0.44
Income from discontinued operations available for common stockholders (in usd per share)	0.00	0.07	0.14
Net income available to common stockholders (in usd per share)	$ 0.52	$ 0.31	$ 0.58
CPLP
Numerator:
Net income attributable to other noncontrolling interests from continuing operations	$ (3,681)	$ (784)	$ 0
Numerator:
Net income attributable to other noncontrolling interests from continuing operations	(3,681)	(784)	0
Other Noncontrolling Interests
Numerator:
Net income attributable to other noncontrolling interests from continuing operations	(3)	(211)	(111)
Numerator:
Net income attributable to other noncontrolling interests from continuing operations	$ (3)	$ (211)	$ (111)