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Debt (Details Textual) - USD ($) |  |  |  |  | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 23, 2014 | Apr. 02, 2014 | Nov. 15, 2013 | Mar. 20, 2013 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2013 | Dec. 31, 2014
Debt [Line Items] |  |  |  |  |  |  |  |
Long-term Line of Credit, Noncurrent |  |  |  |  | $ 0 |  |  | $ 0
Debt Instrument, Unamortized Premium |  |  |  |  | 6,427,000 |  |  | 7,017,000
Interest Paid |  |  |  |  | 25,768,000 | $ 22,623,000 |  |
Letters of Credit Outstanding, Amount |  |  |  |  | 5,051,000 |  |  |
Outstanding Checks |  |  |  |  | $ 64,318,000 |  |  | $ 72,147,000
6.75% Notes |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 550,000 |  |  |  |
Debt instrument, stated interest rate |  |  |  | 6.75% | 6.75% |  |  |
Debt Instrument, Maturity Year |  |  |  | 2020 |  |  |  |
Debt Instrument, Maturity Date |  |  |  | Apr. 01, 2020 |  |  |  |
Proceeds from Offering |  |  |  | $ 537,600,000 |  |  |  |
Debt Instrument, Redemption Date, One |  |  |  |  | Apr. 01, 2016 |  |  |
Debt Instrument, Redemption Date, Two |  |  |  |  | Apr. 01, 2017 |  |  |
Debt Instrument, Redemption Date, Latest For Redemption At Face Amount |  |  |  |  | Apr. 01, 2018 |  |  |
Debt Instrument, Percentage Of Redemption Price, Redemption Date One |  |  |  |  | 103.375% |  |  |
Debt Instrument, Percentage Of Redemption Price, Redemption Date Two |  |  |  |  | 101.688% |  |  |
Debt Instrument, Percentage Of Redemption Price, Redemption Date, Latest For Redemption At Face Amount |  |  |  |  | 100.00% |  |  |
Debt Instrument, Percentage Redeemable Redemption Date, Additional |  |  |  |  | 106.75% |  |  |
Debt Instrument, Percentage Of Redemption Price Redemption Date, Additional |  |  |  |  | 35.00% |  |  |
Debt Instrument, Percentage Of Redemption Price, Change In Ownership Control |  |  |  |  | 101.00% |  |  |
11% Notes |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |
Debt instrument, stated interest rate |  |  |  | 11.00% |  |  |  |
Loss on redemption of notes |  |  |  |  |  |  | $ 55,588,000 |
6.75% Notes issued in November 2013 |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |
Debt instrument, stated interest rate |  |  | 6.75% |  |  |  |  |
Additional borrowing face amount |  |  | $ 110,000,000 |  |  |  |  |
Proceeds from Offering |  |  | 111,925,000 |  |  |  |  |
Debt Instrument, Unamortized Premium |  |  | 4,125,000 |  |  |  |  |
Expense Related to Distribution or Servicing and Underwriting Fees |  |  | $ 2,200,000 |  |  |  |  |
6.75% Notes Issued in April 2014 |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |
Debt instrument, stated interest rate |  | 6.75% |  |  |  |  |  |
Additional borrowing face amount |  | $ 75,000,000 |  |  |  |  |  |
Proceeds from Offering |  | 77,452,000 |  |  |  |  |  |
Debt Instrument, Unamortized Premium |  | 3,938,000 |  |  |  |  |  |
Expense Related to Distribution or Servicing and Underwriting Fees |  | $ 1,500,000 |  |  |  |  |  |
Wells Fargo Capital Finance, LLC |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |
Line of Credit Facility, Increase (Decrease), Net | $ 100,000,000 |  |  |  |  |  |  |
Long-term Line of Credit |  |  |  | $ 225,000,000 |  |  |  |
Debt Instrument, Maturity Date | Sep. 30, 2019 |  |  |  |  |  |  |
Debt Instrument, Face Amount | $ 325,000,000 |  |  |  |  |  |  |
Line of Credit Facility, Description |  |  |  | Dec. 31, 2018 |  |  |  |
Wells Fargo Capital Finance, LLC | Base Rate |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |
Debt instrument, stated interest rate | 1.00% |  |  |  | 1.00% |  |  |
Wells Fargo Capital Finance, LLC | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |
Debt instrument, stated interest rate | 1.75% |  |  |  | 1.75% |  |  |

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- Definition The percentage of the face amount applicable to the additional set in the series of latest date, before maturity, on which the issuer can call the outstanding debt instrument for repayment or conversion to equity. + References No definition available. + Details
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- Definition The percentage of the face amount applicable to the first set in the series of latest date, before maturity, on which the issuer can call the outstanding debt instrument for repayment or conversion to equity. + References No definition available. + Details
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- Definition The percentage of the face amount that can be redeemed, applicable to the additional set in the series of latest date, before maturity, on which the issuer can call the outstanding debt instrument for repayment or conversion to equity. + References No definition available. + Details
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- Definition The latest date, before maturity, on which the issuer can call the outstanding debt instrument for repayment or conversion to equity at face amount, which may be presented in a variety of ways (year only, month and year, day, month and year, quarter, etc.). + References No definition available. + Details
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- Definition The first set in the series of latest date, before maturity, on which the issuer can call the outstanding debt instrument for repayment or conversion to equity, which may be presented in a variety of ways (year only, month and year, day, month and year, quarter, etc.). + References No definition available. + Details
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- Definition The second set in the series of latest date, before maturity, on which the issuer can call the outstanding debt instrument for repayment or conversion to equity, which may be presented in a variety of ways (year only, month and year, day, month and year, quarter, etc.). + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The amount of debt premium that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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- Definition Expense related to distribution, servicing and underwriting fees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.14) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition Amount of gain (loss) from the difference between the repurchase price of a debt instrument initially issued by the entity and the net carrying amount of the debt at the time of its repurchase. + References No definition available. + Details
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- Definition The amount of cash paid for interest during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3536-108585 + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of increase (decrease) of the credit facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The carrying value as of the balance sheet date of the noncurrent portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=28361426&loc=d3e1314-112600 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=28361426&loc=d3e1336-112600 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Line-of-Credit Arrangement -URI http://asc.fasb.org/extlink&oid=6517033 + Details
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