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Common Stock (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 11 Months Ended | 12 Months Ended | 34 Months Ended | 44 Months Ended
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Feb. 28, 2015 | Nov. 30, 2014 | Dec. 31, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2015 | Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Underwriters over allotment of shares (in shares) |  |  | 712,500 |  |  |  |  |  |
Shares Issued, price per share |  |  | $ 38.16 |  |  |  |  |  |
Proceeds from issuance of common stock |  |  | $ 199,961 |  | $ 332,117 | $ 360,072 | $ 267,613 |  |
Stock issuance costs |  |  | $ 8,488 |  | $ 4,178 | $ 10,683 | $ 3,774 |  |
Stock issued during period, shares |  |  | 5,462,500 |  | 34,230 | 5,493,595 | 29,013 |  |
Issuance of common stock |  |  |  |  | $ 991 | $ 209,240 | $ 744 |  |
Stock issuance costs |  |  |  |  | $ 4,198 | $ 10,726 | $ 13,529 |  |
2012 ATM Equity Program |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of shares authorized to be issued |  |  |  |  | 9,000,000 |  |  |  |
Stock issued during period, shares |  |  |  |  | 0 | 0 | 4,676,542 |  | 8,958,840
Average stock price per share |  |  |  |  |  |  | $ 32.60 |  |
Issuance of common stock |  |  |  |  |  |  | $ 152,435 |  |
Stock issuance costs | [1] |  |  |  |  |  | $ 2,161 |  |
2013 ATM Equity Program |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of shares authorized to be issued |  |  |  |  | 9,000,000 |  |  |  |
Stock issued during period, shares |  |  |  |  | 214,000 | 3,758,362 | 2,280,450 | 6,252,812 |
Average stock price per share |  |  |  |  | $ 39.84 | $ 35.90 | $ 37.80 |  |
Issuance of common stock |  |  |  |  | $ 8,525 | $ 134,919 | $ 86,208 |  |
Stock issuance costs | [1] |  |  |  | $ 130 | 2,195 | 1,613 |  |
2015 ATM Equity Program |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of shares authorized to be issued |  |  |  |  | 10,000,000 |  |  |  |
Stock issued during period, shares |  |  |  | 8,359,533 | 8,359,533 |  |  |  |
Average stock price per share |  |  |  |  | $ 37.39 |  |  |  |
Issuance of common stock |  |  |  |  | $ 312,542 |  |  |  |
Stock issuance costs | [1] |  |  |  | 3,886 |  |  |  |
DRIP |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock |  |  |  |  | $ 7,182 | $ 14,817 | $ 25,407 |  |
Shares reserved for future issuance, dividend reinvestment plan |  | 16,000,000 |  |  |  |  |  |  |
Shares of common stock |  |  |  |  | 196,584 | 422,406 | 764,891 |  |
[1] | Stock issuance costs consist primarily of underwriters' fees and commissions, and legal and accounting fees.

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