Goodwill and Other Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
Mar. 31, 2014	Mar. 31, 2015	Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]
Weighted-Average Amortization Period (in years)	14 years	13 years	14 years
Gross Carrying Amount	$ 101,982	$ 109,604	$ 101,963
Accumulated Amortization	26,026	37,316	24,140
Net Carrying Amount	75,956us-gaap_FiniteLivedIntangibleAssetsNet	72,288us-gaap_FiniteLivedIntangibleAssetsNet	77,823us-gaap_FiniteLivedIntangibleAssetsNet
Intangibles not subject to amortization
Goodwill	127,934us-gaap_Goodwill	127,934us-gaap_Goodwill	128,725us-gaap_Goodwill
Trademarks	15,455	15,455	15,455
Total goodwill and other intangible assets	219,345	215,677	222,003
Changes in goodwill
Goodwill, gross, balance at the beginning of the period	144,556us-gaap_GoodwillGross	143,765us-gaap_GoodwillGross	144,556us-gaap_GoodwillGross
Additions to prior acquisitions, gross	(791)	0	0
Goodwill, gross, balance at the end of the period	143,765us-gaap_GoodwillGross	143,765us-gaap_GoodwillGross	144,556us-gaap_GoodwillGross
Accumulated impairment, balance at the beginning of the period	(15,831)	(15,831)	(15,831)
Accumulated impairment, balance at the end of the period	(15,831)	(15,831)	(15,831)
Goodwill, net, balance at the beginning of the period	128,725us-gaap_Goodwill	127,934us-gaap_Goodwill	128,725us-gaap_Goodwill
Additions to prior acquisitions, net	(791)
Goodwill, net, balance at the end of the period	$ 127,934us-gaap_Goodwill	$ 127,934us-gaap_Goodwill	$ 128,725us-gaap_Goodwill

Finite Lived Intangible Assets, Period Increase (Decrease), Gross

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Sum of the carrying amounts of goodwill and other intangible assets, as of the balance sheet date, net of accumulated amortization and impairment charges.

+ References

No definition available.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of increase (decrease) in carrying value of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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No definition available.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (b)

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