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Subsequent event (Notes) | 6 Months Ended
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Jun. 30, 2015
Subsequent Event [Line Items] |
Subsequent event [Text Block] | Subsequent Event On July 21, 2015, the Company entered into a $75.0 million term loan agreement with a variable interest rate which matures on July 20, 2016. The agreement contains customary covenants and provisions, including a covenant of the Company not to permit, at any time, the ratio of funded debt to capitalization (on either a consolidated or unconsolidated basis) to be greater than 65 percent. Other covenants include restrictions on the sale of certain assets and the making of certain investments.

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration