Debt (Details 2) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Debt
Fixed-rate debt	$ 469,604	$ 358,590
Variable-rate debt	154,699	76,999
Not recorded at fair value
Debt
Fixed-rate debt	366,627	329,544
Fair Value \| Level 2 - Market approach
Debt
Fixed-rate debt	353,076	319,429
Carried at fair value
Debt
Variable-rate debt	$ 103,000	$ 104,000

The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time.

No definition available.

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