Fair Value Measurements (Narrative) (Details) $ in Millions	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Fair Value Measurements [Abstract]
Adjustment Interval of Variable Rate on Interest Rate Swap	90
Interest rate swap agreement for notional amount	$ 100.0
Fair value of long term debt	$ 1,355.5	$ 1,508.0

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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- Definition

Adjustment interval of variable interest rate on $100M interest rate swap

+ References

No definition available.

+ Details

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- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13476-108611

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- References

No definition available.

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