|
Debt (Details Textuals) (USD $)
In Millions, unless otherwise specified
|
3 Months Ended |
|
|
|
Mar. 31, 2015
|
Mar. 31, 2013
|
Mar. 31, 2006
|
Dec. 31, 2014
|
| Debt Instrument [Line Items] |
|
|
|
|
| Discussion Of Senior Notes Interest Rate Cash Flow Hedge Effective Rate |
This reduced the effective interest rate from 5.50 percent to 5.36 percent. |
|
|
|
| Debt (Textuals) |
|
|
|
|
| Repayments of Long-term Debt |
|
$ 75.0 |
|
|
| Debt Instrument, Covenant Compliance |
As of March 31, 2015 the Company was in compliance with the financial covenants in its debt agreements. |
|
|
|
| Senior Notes [Member] |
|
|
|
|
| Debt (Textuals) |
|
|
|
|
| Issuance of Senior Notes, Principal amount |
|
|
300.0 |
|
| Notional Amount Of Senior Notes Interest Rate Cash Flow Hedge Derivatives |
|
|
200.0 |
|
| Debt, Weighted Average Interest Rate |
|
|
5.50% |
|
| Effective interest rate before cash flow hedge |
|
|
5.50% |
|
| Effective interest rate after cash flow hedge |
|
|
5.36% |
|
| Senior Notes Due 2016 [Member] |
|
|
|
|
| Debt (Textuals) |
|
|
|
|
| Senior Notes Maturity Schedule |
175.0 |
|
|
|
| Senior Notes Due 2018 [Member] |
|
|
|
|
| Debt (Textuals) |
|
|
|
|
| Senior Notes Maturity Schedule |
50.0 |
|
|
|
| Industrial development revenue bonds [Member] |
|
|
|
|
| Debt (Textuals) |
|
|
|
|
| Debt, Weighted Average Interest Rate |
0.21% |
|
|
0.27% |
| Maturity of bonds issued |
Jun. 01, 2017 |
|
|
|
| Bond maturity period |
20 years |
|
|
|
| Revolving Credit Facility [Member] |
|
|
|
|
| Debt (Textuals) |
|
|
|
|
| Line of Credit Facility, Current Borrowing Capacity |
520.0 |
|
|
500.0 |
| Increase in borrowing limits under credit facility agreement |
250.0 |
|
|
|
| Weighted average interest rate on credit facility borrowings outstanding |
1.69% |
|
|
1.69% |
| Line of credit facility description of variable rate basis |
LIBOR |
|
|
|
| Amount available under credit facility |
225.0 |
|
|
|
| Swing Line Sub-Facility [Member] |
|
|
|
|
| Debt (Textuals) |
|
|
|
|
| Increase in borrowing limits under credit facility agreement |
50.0 |
|
|
|
| Uncommitted Line of Credit [Member] |
|
|
|
|
| Debt (Textuals) |
|
|
|
|
| Borrowing limit of short term uncommitted line of credit |
122.3 |
|
|
|
| Weighted average interest rate on outstanding borrowings |
3.02% |
|
|
2.96% |
| Maturity time of short term uncommitted lines |
less than one year |
|
|
|
| Amount available under credit facility |
78.3 |
|
|
|