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Earnings Per Share and Stockholders' Equity (Stockholders' Equity Narrative) (Details) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2015 USD ($) occasions $ / shares shares | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Forward Contract Indexed to Issuer's Equity [Line Items] |  |  |  |
Public offering related to equity forward transaction, shares | 8,600,000 |  |  |
Forward rate per share | $ / shares | $ 25.25 |  |  |
Shares subject to forward sale agreement | 4,300,000 |  |  |
Stock issued during period, shares | 4,300,000 |  |  |
Proceeds from issuance of common stock | $ | $ 104,500 | $ 112,481 | $ 13,681 | $ 31,764
Optional shares available to underwriters | 1,290,000 |  |  |
Minimum [Member] |  |  |  |
Forward Contract Indexed to Issuer's Equity [Line Items] |  |  |  |
Number of potential issuances under the forward sale agreement | occasions | 1 |  |  |
Maximum [Member] |  |  |  |
Forward Contract Indexed to Issuer's Equity [Line Items] |  |  |  |
Forward sale agreement maturity | 12 months |  |  |

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- Definition The per share price of the Company's stock at which the contract holder of the freestanding contract has the right to purchase or sell the Company's stock at a future date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 40 -Section 50 -Paragraph 5 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6445032&loc=d3e90205-114008 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(1) -URI http://asc.fasb.org/extlink&oid=6940734&loc=d3e22047-110879 + Details
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