Condensed Consolidated Statements of Stockholders' Deficiency - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance (in shares)			140,914,642
Beginning Balance	$ (590,101)	$ (394,219)	$ (547,366)	$ (331,760)
Impact of adoption of new accounting standards			(1,550)	(12,857)
Net income	39,307	18,996	54,340	22,660
Total other comprehensive income	605	319	1,186	569
Distributions and dividends on common stock	(58,797)	(55,912)	(117,574)	(111,812)
Restricted stock grant	0	0	0	0
Effect of stock dividend		0		0	[1]
Surrender of shares in connection with restricted stock vesting	(48)		(221)
Stock-based compensation	$ 2,338	2,456	4,774	4,840
Distributions to non-controlling interest		(359)	$ (285)	(359)
Ending Balance (in shares)	140,953,900		140,953,900
Ending Balance	$ (606,696)	$ (428,719)	$ (606,696)	$ (428,719)
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance (in shares)	140,899,065	134,365,424	140,914,642	134,365,424
Beginning Balance	$ 14,090	$ 13,437	$ 14,092	$ 13,437
Restricted stock grant (in shares)	60,000	31,666	60,000	31,666
Restricted stock grant	$ 6	$ 3	$ 6	$ 3
Effect of stock dividend (in shares)		6,719,855		6,719,855	[1]
Effect of stock dividend		$ 672		$ 672	[1]
Surrender of shares in connection with restricted stock vesting (in shares)	(5,165)		(20,742)
Surrender of shares in connection with restricted stock vesting	$ (1)		$ (3)
Ending Balance (in shares)	140,953,900	141,116,945	140,953,900	141,116,945
Ending Balance	$ 14,095	$ 14,112	$ 14,095	$ 14,112
Additional Paid-in Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	0	0	0	0
Distributions and dividends on common stock	(2,285)	(2,453)	(4,550)	(4,837)
Restricted stock grant	(6)	(3)	(6)	(3)
Surrender of shares in connection with restricted stock vesting	(47)		(218)
Stock-based compensation	2,338	2,456	4,774	4,840
Ending Balance	0	0	0	0
Accumulated Deficit
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(580,581)	(459,996)	(542,169)	(414,785)
Impact of adoption of new accounting standards			3,147	1,094
Net income	39,307	17,818	54,260	25,029
Distributions and dividends on common stock	(56,512)	(53,459)	(113,024)	(106,975)
Effect of stock dividend		(672)		(672)	[1]
Ending Balance	(597,786)	(496,309)	(597,786)	(496,309)
AOCI Attributable to Parent
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(24,098)	(18,357)	(19,982)	(12,571)
Impact of adoption of new accounting standards			(4,697)	(6,036)
Total other comprehensive income	605	319	1,186	569
Ending Balance	(23,493)	(18,038)	(23,493)	(18,038)
Non-controlling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	488	70,697	693	82,159
Impact of adoption of new accounting standards				(7,915)
Net income		1,178	80	(2,369)
Distributions to non-controlling interest		(359)	(285)	(359)
Ending Balance	$ 488	$ 71,516	$ 488	$ 71,516

[1] Represents the effect of the September 27, 2018 stock dividend on the second quarter 2018 common-stock activity.