Stockholders' Equity (Details Textual) - USD ($)				1 Months Ended									12 Months Ended
	Jan. 01, 2019	Oct. 04, 2018	Aug. 03, 2016	Dec. 31, 2018	Sep. 28, 2018	Jan. 31, 2018	Oct. 26, 2017	Feb. 14, 2017	Jan. 31, 2017	Jan. 24, 2017	Jan. 17, 2017	Mar. 24, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Feb. 28, 2018	Dec. 20, 2017	Jan. 11, 2017	Oct. 13, 2016	Aug. 08, 2016
Class of Stock [Line Items]
Proceeds from Issuance of Common Stock													$ 25,000	$ 57,376,000	$ 51,000
Stock Repurchased During Period, Value													$ 9,018,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 months
Preferred Stock Redemption Fee percentage				13.00%									13.00%
Preferred Stock Redemption Fee percentageafter One Year				10.00%									10.00%
Preferred Stock Redemption Fee percentage after Three Year				5.00%									5.00%
Preferred Stock Redemption Fee percentage after Four Year				3.00%									3.00%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period													1,158,963,000	7,500,000	7,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross						1,056,211
OP Unit holders [Member]
Class of Stock [Line Items]
Partners' Capital Account, Units				6,386,841									6,386,841
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest													20.22%
LTIP Unit holders [Member]
Class of Stock [Line Items]
Partners' Capital Account, Units				1,796,029									1,796,029
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest													5.69%
OP And LTIP Unit holders [Member]
Class of Stock [Line Items]
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest													25.91%
OP [Member]
Class of Stock [Line Items]
Percentage Of Unvested Incentive Plan In Operating Partnership				3.09%									3.09%
2015 Long term Incentive Plan Units [Member]
Class of Stock [Line Items]
Long Term Incentive Plan Units Vesteded													94,463
General and Administrative Expense [Member]
Class of Stock [Line Items]
Allocated Share-based Compensation Expense														$ 2,200,000	$ 2,400,000
Common Class A [Member]
Class of Stock [Line Items]
Proceeds from Issuance of Common Stock									$ 49,800,000	$ 7,500,000
Stock Issued During Period, Shares, New Issues										600,000	4,000,000		2,831	4,604,701	4,265
Common Stock, Par or Stated Value Per Share				$ 0.01							$ 0.01		$ 0.01	$ 0.01
Sale of Stock, Price Per Share																		$ 13.15
Preferred Stock, Value, Issued																				$ 100,000,000
Redemption Of SeriesB Preferred Stock And Conversion Into Class Common Stock Shares													155,978	23,785
Stock Repurchase Program, Authorized Amount																$ 25,000,000
Stock Repurchased During Period, Shares													1,055,057
Stock Repurchased During Period, Value													$ 11,000
Common Class A [Member] | New Plan [Member]
Class of Stock [Line Items]
Stock Repurchase Program, Authorized Amount				$ 5,000,000									$ 5,000,000
Stock Repurchase Program Term plan				1 year
Common Class A [Member] | Stock Offering [Member]
Class of Stock [Line Items]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights				6,165,560									6,165,560
Redemption Of SeriesB Preferred Stock And Conversion Into Class Common Stock Shares													155,978
Stock Repurchased During Period, Value													$ 9,000,000
Series B Preferred Stock [Member]
Class of Stock [Line Items]
Stock Issued During Period, Shares, New Issues													308,278
Preferred Stock, Dividend Rate, Percentage													6.00%
Series B Preferred Stock [Member] | Stock Offering [Member]
Class of Stock [Line Items]
Proceeds from Issuance of Common Stock													$ 277,500,000
Stock Issued During Period, Shares, New Issues													123,592
Proceeds from Issuance of Preferred Stock and Preference Stock													$ 111,200,000
Class of Warrant or Right, Outstanding				308,278									308,278
Proceeds from Issuance or Sale of Equity													$ 12,400,000
Payments for Repurchase of Preferred Stock and Preference Stock													$ 135,700
Stock Repurchased During Period, Shares													1,564
Class A and Class C common stock [Member]
Class of Stock [Line Items]
Dividends Payable, Amount Per Share																	$ 0.1625
Common Class C [Member]
Class of Stock [Line Items]
Stock Issued During Period, Shares, New Issues													0	0	0
Common Stock, Par or Stated Value Per Share				$ 0.01									$ 0.01	$ 0.01
Redemption Of SeriesB Preferred Stock And Conversion Into Class Common Stock Shares													0	0
Stock Repurchased During Period, Shares													0
Stock Repurchased During Period, Value													$ 0
Series C Cumulative Redeemable Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock Increase In Annual Dividend Rate													2.00%
Preferred Stock, Redemption Price Per Share				25.00									$ 25.00
Preferred Stock, Dividend Rate, Percentage													7.625%
Series C Cumulative Redeemable Preferred Stock [Member] | Maximum [Member]
Class of Stock [Line Items]
Preferred Stock Increase In Annual Dividend Rate													14.00%
Series A Cumulative Redeemable Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock, Redemption Price Per Share				$ 25.00									$ 25.00
Series A Cumulative Redeemable Preferred Stock [Member] | Maximum [Member]
Class of Stock [Line Items]
Preferred Stock Increase In Annual Dividend Rate													14.00%
Series A Cumulative Redeemable Preferred Stock [Member] | Minimum [Member]
Class of Stock [Line Items]
Preferred Stock Increase In Annual Dividend Rate													2.00%
Series D Cumulative Redeemable Preferred Stock [Member]
Class of Stock [Line Items]
Shares Issued, Price Per Share																			$ 25.00
Preferred Stock, Dividend Rate, Percentage													7.125%
Cumulative Preferred Stock [Member] | Series A [Member]
Class of Stock [Line Items]
Preferred Stock, Dividend Rate, Percentage													8.25%	8.25%
Common Stock [Member]
Class of Stock [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount													194,338	391	4,282
Common Class B [Member] | Stock Offering [Member]
Class of Stock [Line Items]
Redemption Of SeriesB Preferred Stock And Conversion Into Class Common Stock Shares													149
Long-term Incentive Plan Units [Member]
Class of Stock [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other Than Options, Grants in Period, Grant Date Fair Value								$ 100,000				$ 100,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period								7,500				7,500
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross		80,798
Long-term Incentive Plan Units [Member] | Time-based LTIP Units [Member]
Class of Stock [Line Items]
Share-based Compensation													$ 5,300,000	$ 100,000	$ 200,000
Long-term Incentive Plan Units [Member] | Performance Based LTIP Units [Member]
Class of Stock [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross						125,165
Long-term Incentive Plan Units [Member] | 2016 Long term Incentive Plan Units [Member]
Class of Stock [Line Items]
Long Term Incentive Plan Units Vesteded													117,740
Long-term Incentive Plan Units [Member] | Share-based Compensation Award, Tranche One [Member] | Time-based LTIP Units [Member]
Class of Stock [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross						770,854
Long-term Incentive Plan Units [Member] | Share-based Compensation Award, Tranche Two [Member] | Time-based LTIP Units [Member]
Class of Stock [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross						160,192
Incentive Plans 2014 [Member] | Long-term Incentive Plan Units [Member]
Class of Stock [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period													3 years 2 months 12 days
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized				$ 6,300,000									$ 6,300,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross		3,165				6,263
Incentive Plans 2014 [Member] | Long-term Incentive Plan Units [Member] | Executive Officer [Member] | Shortfall LTIP Units [Member]
Class of Stock [Line Items]
Aggregate of number of shares unavailable for issuance						81,000
Incentive Plans 2014 [Member] | Long-term Incentive Plan Units [Member] | Common Class A [Member]
Class of Stock [Line Items]
Stock Issued During Period, Shares, New Issues					2,250,000		1,075,000
Incentive Plan [Member]
Class of Stock [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			176,610										212,203