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Earnings Per Share and Stockholders' Equity (Stockholders' Equity Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended	12 Months Ended
	Aug. 01, 2016	Aug. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Earnings Per Share [Abstract]
Public offering related to equity forward transaction, shares		8,600,000
Forward rate per share		$ 25.25
Shares subject to forward sale agreement		4,300,000
Optional shares available to underwriters		1,290,000
Stock issued during period, shares	5,590,000
Proceeds from issuance of common stock	$ 134,700		$ 139,654	$ 112,481	$ 13,681

X

- Definition

Represents the number of shares in connection with public offering under the equity forward transaction.

+ References

No definition available.

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- Definition

The number of shares that the underwriters have an option to purchase for a definite time period after close of forward equity transaction.

+ References

No definition available.

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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)
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-Publisher FASB
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- Definition

The maximum number of shares that could be issued to net share settle a contract, if applicable. If a contract does not have a fixed or determinable maximum number of shares that may be required to be issued, disclose the fact that a potentially infinite number of shares could be issued to settle the contract.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
-Paragraph 5
-Subparagraph (b)(2)
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- Definition

The cash inflow from the additional capital contribution to the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

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-Publisher FASB
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- Definition

Number of new stock issued during the period.

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