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Financial Instruments (Narrative) (Details) (USD $) Share data in Millions, unless otherwise specified |  | 3 Months Ended |  |  |  |  | 0 Months Ended | 3 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2013 | Mar. 31, 2013 Private Placement, Notes [Member] | Mar. 31, 2013 Credit Agreement [Member] | Dec. 31, 2010 Credit Agreement [Member] | Mar. 31, 2013 Credit Agreement [Member] Interest Rate Swap [Member] | Jan. 16, 2013 Credit Agreement [Member] Interest Rate Swap [Member] | Jul. 16, 2010 Credit Agreement [Member] Interest Rate Swap [Member] | Mar. 15, 2013 Convertible Notes [Member] | Mar. 31, 2013 Convertible Notes [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt issued |  | $ 150,000,000 |  |  |  |  |  |  | $ 28,437,000
Interest rate |  | 6.84% |  |  |  |  |  |  | 2.25%
Maturity date |  | Oct. 25, 2017 |  |  |  |  |  |  |
Year of maturity |  |  | 2018 |  |  |  |  |  | 2026
Payment required on October 25, 2013 |  | 50,000,000 |  |  |  |  |  |  |
Payment required on October 25, 2015 |  | 50,000,000 |  |  |  |  |  |  |
Fair value of long-term debt |  | 170,600,000 |  |  |  |  |  |  |
Amount of credit facility |  |  | 330,000,000 | 390,000,000 |  |  |  |  |
Amount of credit facility outstanding |  |  | 176,000,000 |  |  |  |  |  |
Additional amount that can be borrowed on facility |  |  | 154,000,000 |  |  |  |  |  |
Notional amount |  |  |  |  | 105,000,000 |  | 105,000,000 |  |
Fixed interest rate in swap |  |  |  |  |  |  | 2.04% |  |
LIBOR spread |  |  |  |  |  | 0.31% |  |  |
Effective annual rate |  |  |  |  | 3.415% |  |  |  |
Maximum leverage ratio allowed | 3.50 |  |  |  |  |  |  |  |
Minimum interest coverage ratio required | 3.00 |  |  |  |  |  |  |  |
Leverage ratio | 1.36 |  |  |  |  |  |  |  |
Interest coverage ratio | 11.16 |  |  |  |  |  |  |  |
Percentage of principal redeemed |  |  |  |  |  |  |  | 100.00% |
Cash paid to redeem convertible senior notes |  |  |  |  |  |  |  | $ 28,400,000 |
Number of warrants sold |  |  |  |  |  |  |  |  | 4.1
Strike price of warrants |  |  |  |  |  |  |  |  | 52.25
Date warrants can be exercised |  |  |  |  |  |  |  |  | Jun. 15, 2013

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