Common stock dividends declared, quarterly

No definition available.

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- Definition

Gross proceeds from the issuance of common stock

+ References

No definition available.

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- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

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- Definition

Date the declared dividend will be paid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

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- Definition

Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

+ References

No definition available.

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- Definition

Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

+ 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

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

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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

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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- Definition

Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

+ References

No definition available.

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- Definition

Number of new stock issued during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

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-Topic 505

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-Section S99

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

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- Definition

Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering.

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- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

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Stockholders' Equity (Details) (USD $)	0 Months Ended	3 Months Ended	12 Months Ended
Stockholders' Equity (Details) (USD $)	Feb. 21, 2012	Mar. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Nov. 15, 2013	Nov. 16, 2012
Stockholders Equity [Line Items]
Gross proceeds from the sale of common stock	$ 225,000,000
Sale of common stock, price per share	$ 36.75us-gaap_SaleOfStockPricePerShare
Proceeds from Issuance of Common Stock			0	0	218,961,000
Stock repurchase program, authorized amount						70,000,000	100,000,000
Dividends declared, per share			$ 0.50
Common stock dividends declared, quarterly		$ 0.125	$ 0.125
Sale of common stock, value			(25,039,000)	(18,633,000)
Payments of Dividends			25,039,000us-gaap_PaymentsOfDividends	18,633,000us-gaap_PaymentsOfDividends	0us-gaap_PaymentsOfDividends
Dividends, payment date		Mar. 30, 2015
Dividends, record date		Mar. 02, 2015
Common Stock [Member]
Stockholders Equity [Line Items]
Sale of common stock, shares				0	6,122,449
Sale of common stock, value				$ 0	$ 6,000