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Summary of Significant Accounting Policies (Narrative) (Details) (USD $)
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3 Months Ended |
12 Months Ended |
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Dec. 31, 2014
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Sep. 30, 2014
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Jun. 30, 2014
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Mar. 31, 2014
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Dec. 31, 2013
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Sep. 30, 2013
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Jun. 30, 2013
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Mar. 31, 2013
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Dec. 31, 2014
segment
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Dec. 31, 2013
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Dec. 31, 2012
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| Quantifying Misstatement in Current Year Financial Statements [Line Items] |
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| Revenue |
$ 147,259,000 |
$ 162,654,000 |
$ 171,522,000 |
$ 157,270,000 |
$ 162,225,000 |
$ 182,768,000 |
$ 193,470,000 |
$ 212,986,000 |
$ 638,705,000 |
$ 751,449,000 |
$ 943,405,000 |
| Operating income (loss) |
(10,826,000) |
10,581,000 |
22,414,000 |
(7,858,000) |
(9,870,000) |
19,524,000 |
19,133,000 |
39,676,000 |
14,311,000 |
68,463,000 |
191,627,000 |
| Net income |
(5,248,000) |
6,291,000 |
12,955,000 |
(4,330,000) |
(5,109,000) |
14,211,000 |
12,114,000 |
24,667,000 |
9,668,000 |
45,883,000 |
121,146,000 |
| Deferred compensation, maximum employee contribution, percentage of regular compensation |
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80.00% |
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| Deferred compensation, maximum employee contribution, percentage of incentive compensation |
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100.00% |
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| Deferred compensation, requisite service period |
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4 years |
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| Company obligations under deferred compensation plan |
1,000,000 |
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1,000,000 |
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| Advertising costs |
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|
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89,000,000 |
76,500,000 |
103,700,000 |
| Number of reportable segments |
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1 |
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| Year-End Adjustment [Member] |
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| Quantifying Misstatement in Current Year Financial Statements [Line Items] |
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| Revenue |
(1,700,000) |
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(1,000,000) |
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| Operating income (loss) |
(1,700,000) |
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(700,000) |
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| Net income |
$ (1,000,000) |
$ 200,000 |
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$ (200,000) |
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