Fair Value Measurements (Narrative) (Details) - 7 3/8% Senior Notes [Member] - USD ($)	Sep. 30, 2015	Jun. 30, 2015	Jan. 30, 2014	Jan. 21, 2011
Debt Instrument [Line Items]
Aggregate principle amount	$ 350,000,000			$ 250,000,000
Debt instrument, stated interest rate	7.375%	7.375%	7.375%

Face (par) amount of debt instrument at time of issuance.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant