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Debt (Narrative) (Details) (USD $) | 12 Months Ended | 3 Months Ended |  |  |  | 3 Months Ended | 12 Months Ended |  |  | 12 Months Ended |  | 12 Months Ended |
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Senior Credit Agreement [Member] item | Mar. 31, 2013 Senior Subordinated 8% Notes, Due December 1, 2015 [Member] | Dec. 31, 2013 Senior Subordinated 8% Notes, Due December 1, 2015 [Member] | Jun. 30, 2013 Senior Subordinated 8% Notes, Due December 1, 2015 [Member] | Dec. 31, 2012 Senior Subordinated 8% Notes, Due December 1, 2015 [Member] | Mar. 31, 2013 Senior Subordinated 6.25% Notes [Member] | Dec. 31, 2013 Senior Subordinated 6.25% Notes [Member] | Dec. 31, 2013 Senior Subordinated 6.25% Notes [Member] Change in Control [Member] | Dec. 31, 2013 Senior Subordinated 6.25% Notes [Member] On and After February 1, 2019 [Member] | Dec. 31, 2013 Senior Subordinated 6.25% Notes [Member] Prior to February 1, 2016 [Member] | Dec. 31, 2013 Revolving Credit Facility [Member] | Dec. 31, 2012 Revolving Credit Facility [Member] | Dec. 31, 2013 Minimum [Member] Senior Credit Agreement [Member] | Dec. 31, 2013 Minimum [Member] Senior Subordinated 6.25% Notes [Member] 12-Month Redemption Period Beginning February 1, 2018 [Member] | Dec. 31, 2013 Minimum [Member] Revolving Credit Facility [Member] | Dec. 31, 2013 Maximum [Member] Senior Credit Agreement [Member] | Dec. 31, 2013 Maximum [Member] Senior Subordinated 6.25% Notes [Member] 12-Month Redemption Period Beginning February 1, 2017 [Member] | Dec. 31, 2013 Maximum [Member] Revolving Credit Facility [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Standby letters of credit | $ 12,788,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility, availability amount | 102,821,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility, borrowings outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |  |  |
Maximum borrowing capacity under the revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000,000 |  |  | 250,000,000 |  |
Revolving credit facility termination date |  |  |  | Oct. 10, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility, annual commitment fee |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.375% |  |  |  |  |  |  |
LIBOR floor, plus |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.00% |  |  | 2.50%
Debt instrument, maturity date |  |  |  |  |  |  |  |  |  | Feb. 01, 2021 |  |  |  |  |  |  |  |  |  |  |
Repurchase amount |  |  |  |  |  |  | 204,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase charge |  |  |  |  | 7,166,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prepayment premium |  |  |  |  | 3,702,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Write off of deferred financing costs |  |  |  |  | 2,199,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized original issue discount |  |  |  |  | 1,265,000 |  |  | 1,298,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of deferred financing fees | 3,899,000 | 18,000 | 1,570,000 |  |  |  |  |  | 3,755,000 |  |  |  |  |  |  |  |  |  |  |  |
Senior Subordinated Notes, interest rate |  |  |  |  |  | 8.00% |  |  |  | 6.25% |  |  |  |  |  |  |  |  |  |  |
Fixed charge coverage ratio |  |  |  | 1.25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price of the principal amount, percentage |  |  |  |  |  |  |  |  |  |  | 101.00% |  |  |  |  |  |  |  |  |  |
Notes issued |  |  |  |  |  |  |  |  |  | 210,000,000 |  |  |  |  |  |  |  |  |  |  |
Dividend payment restrictions, annual limit per share | $ 0.25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend payment restrictions, aggregate annual limit | $ 25,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 101.56% |  |  | 103.13% |
Redemption price, percentage of principal amount |  |  |  |  |  |  |  |  |  |  |  | 100.00% | 106.25% |  |  |  |  |  |  |  |
Redemption percentage of aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  |  | 35.00% |  |  |  |  |  |  |  |

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