Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Numerator:
Net income (loss)	$ (22,582)	$ 21,749	$ 13,423	$ 38,155
Net income (loss) available to common stockholders	$ (22,409)	$ 21,276	$ 12,932	$ 37,319
Denominator:
Weighted average common shares - basic (in shares)	112,926	105,073	109,049	105,056
Net income (loss) per common share - basic (in usd per share)	$ (0.20)	$ 0.20	$ 0.12	$ 0.36
Numerator:
Net income (loss)	$ (22,582)	$ 21,749	$ 13,423	$ 38,155
Net income (loss) available for common stockholders before net income attributable to noncontrolling interests in CPLP	$ (22,674)	$ 21,686	$ 13,255	$ 38,016
Denominator:
Weighted average shares — basic (in shares)	112,926	105,073	109,049	105,056
Add:
Potential dilutive common shares - stock options (in shares)	0	58	29	61
Weighted average units of CPLP convertible into common shares (in shares)	1,744	1,744	1,744	1,744
Weighted average common shares - diluted (in shares)	114,670	106,875	110,822	106,861
Net income (loss) per common share - diluted (in usd per share)	$ (0.20)	$ 0.20	$ 0.12	$ 0.36
Stock Option
Add:
Anti-dilutive stock options outstanding (in shares)	27	0	0	3
CPLP
Numerator:
Net income attributable to other noncontrolling interests	$ 265	$ (410)	$ (323)	$ (697)
Numerator:
Net income attributable to other noncontrolling interests	265	(410)	(323)	(697)
Other Noncontrolling Interests
Numerator:
Net income attributable to other noncontrolling interests	(92)	(63)	(168)	(139)
Numerator:
Net income attributable to other noncontrolling interests	$ (92)	$ (63)	$ (168)	$ (139)