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Stockholder's Equity (Narrative) (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jul. 19, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common stock, shares authorized |  | 400,000,000 |  | 400,000,000 |  | 400,000,000
Common stock, par value |  | $ 0.01 |  | $ 0.01 |  | $ 0.01
Preferred stock, shares |  | 100,000,000 |  | 100,000,000 |  |
Preferred stock, par value |  | $ 0.01 |  | $ 0.01 |  |
Common stock, shares issued |  | 58,379,493 |  | 58,379,493 |  | 55,368,737
Net proceeds of common share issuance |  |  |  | $ 107,991,000 | $ 140,853,000 |
Issuance of common stock, net of issuance costs |  |  |  | $ 112,902,000 |  |
Common stock, shares outstanding |  | 58,379,493 |  | 58,379,493 |  | 55,368,737
Non-vested restricted stock awards |  | 357,018 |  | 357,018 |  |
Common Stock [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares repurchase program, authorized repurchase amount, shares |  | 2,000,000 |  | 2,000,000 |  |
Repurchased shares of stock pursuant to share repurchase authorization |  |  |  | 0 |  |
Issuance of common stock, net of issuance costs, Shares |  |  |  | 3,091,020 |  |
Issuance of common stock, net of issuance costs |  |  |  | $ 31,000 |  |
Series A Preferred Stock [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Preferred stock, shares issued |  | 0 |  | 0 |  | 0
Preferred stock, shares outstanding |  | 0 |  | 0 |  | 0
Dividend rate | 7.75% |  |  |  |  |
Redemption date of Series A Preferred Stock | Jul. 19, 2017 |  |  |  |  |
Number of shares redeemed | 1,840,000 |  |  |  |  |
Redemption price of Series A Preferred Stock | $ 25.00 |  |  |  |  |
Accrued and unpaid dividends | $ 0.096875 |  |  |  |  |
Remaining balance of shares available |  | 362,402 |  | 362,402 |  |
$250 Million ATM Program [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common stock aggregate offering price, remaining |  |  |  | $ 230,800,000 |  |
$200 Million ATM Program [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common stock aggregate offering price |  |  |  | 200,000,000 |  |
$150 Million ATM Program [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common stock aggregate offering price |  |  |  |  | $ 150,000,000 |
Weighted average offering price per share |  |  | $ 32.05 |  | $ 30.06 |
Net proceeds of common share issuance |  |  | $ 88,100,000 |  | $ 143,300,000 |
Total compensation to the applicable sales agents |  |  | 1,300,000 |  | 2,100,000 |
Issuance of common stock, net of issuance costs |  |  | 2,788,986 |  | 4,836,086 |
$250 & $200 Million ATM Programs [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Net proceeds of common share issuance |  | $ 104,400,000 |  | 106,400,000 |  |
Total compensation to the applicable sales agents |  | 1,500,000 |  | 1,600,000 |  |
Issuance of common stock, net of issuance costs |  | $ 2,826,167 |  | $ 2,885,401 |  |
LTIP [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Weighted average offering price per share |  |  |  | $ 34.50 |  |
Issuance of common stock, net of issuance costs, Shares |  |  |  | 195,963 |  |
2010 Equity Incentive Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common stock, shares authorized |  | 1,705,000 |  | 1,705,000 |  |
Unrestricted Stock [Member] | Amended and Restated 2010 Equity Incentive Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unrestricted common stock granted, shares |  |  |  | 9,656 |  |
Granted, Weighted Average Grant Date Fair Value |  |  |  | $ 37.29 |  |
Compensation costs |  | $ 400,000 | 400,000 | $ 400,000 | 400,000 |
Restricted Stock [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Non-vested restricted stock awards |  | 357,018 |  | 357,018 |  | 357,183
Unrestricted common stock granted, shares |  |  |  | 27,003 |  |
Granted, Weighted Average Grant Date Fair Value |  |  |  | $ 32.10 |  |
Compensation costs |  | $ 400,000 | $ 500,000 | $ 900,000 | $ 900,000 |
Fair value of the restricted stock granted |  |  |  | $ 900,000 |  |
Vesting period for the restricted stock |  |  |  | 5 years |  |
Total unrecognized compensation costs related to restricted stock issuances |  | $ 4,600,000 |  | $ 4,600,000 |  |
Remaining weighted average period |  |  |  | 2 years 8 months 12 days |  |
Maximum [Member] | $250 Million ATM Program [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common stock aggregate offering price |  |  |  | $ 250,000,000 |  |
Maximum [Member] | 2010 Equity Incentive Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Granted, Weighted Average Grant Date Fair Value |  |  |  | $ 32.10 |  |
Minimum [Member[ | 2010 Equity Incentive Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Granted, Weighted Average Grant Date Fair Value |  |  |  | 14.20 |  |
Weighted Average [Member] | $250 & $200 Million ATM Programs [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Weighted average offering price per share |  | $ 37.48 |  | $ 37.43 |  |

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