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Common Stock (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 28, 2015 | Nov. 30, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock issued during period, shares |  |  | 5,462,500 | 31,807 | 34,230 | 5,493,595
Underwriters over allotment of shares (in shares) |  |  | 712,500 |  |  |
Shares issued, price per share (in USD per share) |  |  | $ 38.16 |  |  |
Proceeds from issuance of common stock |  |  | $ 199,961 | $ 278,040 | $ 332,117 | $ 360,072
Stock issuance costs |  |  | $ 8,488 | $ 4,266 | $ 4,178 | 10,683
Total allowable shares (in shares) |  |  |  | 375,000,000 | 375,000,000 |
Total shares issued as of December 31, 2016 (in shares) |  |  |  | 147,149,945 | 147,149,945 |
Net proceeds |  |  |  | $ 1,148 | $ 991 | 209,240
Stock issuance costs |  |  |  | 15,204 | 4,198 | 10,726
DRIP |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Proceeds from issuance of common stock |  |  |  | $ 8,340 | $ 7,182 | $ 14,817
Shares reserved for future issuance, dividend reinvestment plan (in shares) |  | 16,000,000 |  |  |  |
Shares of common stock (in shares) |  |  |  | 187,626 | 196,584 | 422,406
2012 ATM Equity Program |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock issued during period, shares |  |  |  |  |  | 0
2013 ATM Equity Program |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Total allowable shares (in shares) |  |  |  | 9,000,000 |  |
Total shares issued as of December 31, 2016 (in shares) |  |  |  | 6,252,812 |  |
2015 ATM Equity Program |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Total allowable shares (in shares) |  |  |  | 10,000,000 |  |
Total shares issued as of December 31, 2016 (in shares) |  |  |  | 9,852,465 |  |
2016 ATM Equity Program |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock issued during period, shares |  |  |  | 5,716,222 | 8,573,533 | 3,758,362
Total allowable shares (in shares) |  |  |  | 12,000,000 |  |
Total shares issued as of December 31, 2016 (in shares) |  |  |  | 4,223,290 |  |
Average stock price per share (net) (in USD per share) |  |  |  | $ 46.48 | $ 37.45 | $ 35.90
Net proceeds |  |  |  | $ 265,696 | $ 321,067 | $ 134,919
Stock issuance costs | [1] |  |  | $ 4,266 | $ 4,016 | $ 2,195
[1] | Stock issuance costs consist primarily of underwriters' fees and commissions, and legal and accounting fees.

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