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, 2016	Dec. 31, 2015	Dec. 31, 2014
Numerator:
Income from continuing operations	$ 60,941	$ 94,332	$ 12,886
Dividends to preferred stockholders	0	0	(2,955)
Preferred Share original issue costs	0	0	(3,530)
Income from continuing operations available for common stockholders	59,946	94,221	5,397
Income from discontinued operations	19,163	31,297	40,122
Net income available for common stockholders	$ 79,109	$ 125,518	$ 45,519
Denominator:
Weighted average common shares - basic	253,895	215,827	204,216
Income from continuing operations available for common stockholders (in usd per share)	$ 0.24	$ 0.44	$ 0.02
Income from discontinued operations available for common stockholders (in usd per share)	0.07	0.14	0.20
Net income available to common stockholders (in usd per share)	$ 0.31	$ 0.58	$ 0.22
Numerator:
Income from continuing operations	$ 60,941	$ 94,332	$ 12,886
Dividends to preferred stockholders	0	0	(2,955)
Preferred Share original issue costs	0	0	(3,530)
Income from continuing operations available for common stockholders before net income attributable to noncontrolling interests in CPLP	60,730	94,221	5,397
Income from discontinued operations	19,163	31,297	40,122
Net income available for common stockholders before net income attributable to noncontrolling interests in CPLP	$ 79,893	$ 125,518	$ 45,519
Denominator:
Weighted average shares — basic	253,895	215,827	204,216
Add:
Stock options using treasury method	178	152	244
Noncontrolling interests CPLP	1,950	0	0
Weighted average common shares - diluted	256,023	215,979	204,460
Income from continuing operations available for common stockholders (in usd per share)	$ 0.24	$ 0.44	$ 0.02
Income from discontinued operations available for common stockholders (in usd per share)	0.07	0.14	0.20
Net income available to common stockholders (in usd per share)	$ 0.31	$ 0.58	$ 0.22
Subsidiaries
Numerator:
Net (income) attributable to other noncontrolling interests from continuing operations	$ (784)	$ 0	$ 0
Numerator:
Net (income) attributable to other noncontrolling interests from continuing operations	(784)	0	0
Other Noncontrolling Interests
Numerator:
Net (income) attributable to other noncontrolling interests from continuing operations	(211)	(111)	(1,004)
Numerator:
Net (income) attributable to other noncontrolling interests from continuing operations	$ (211)	$ (111)	$ (1,004)