Long-Term Debt (Details) (USD $)	9 Months Ended			9 Months Ended									0 Months Ended		3 Months Ended	0 Months Ended		3 Months Ended	0 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Sep. 30, 2013 Senior secured revolving credit facility [Member]	Jun. 30, 2011 Senior secured revolving credit facility [Member]	Jun. 30, 2011 Senior secured revolving credit facility [Member] Minimum [Member]	Jun. 30, 2011 Senior secured revolving credit facility [Member] Maximum [Member]	Jun. 30, 2011 Senior secured revolving credit facility [Member] Alternative Testing for Covenant [Member] Minimum [Member]	Sep. 30, 2013 Senior Notes [Member]	Mar. 11, 2010 Senior Notes [Member]	Sep. 30, 2013 Senior Notes, Issued [Member] Senior Notes [Member]	Dec. 31, 2012 Senior Notes, Issued [Member] Senior Notes [Member]	Mar. 11, 2010 Senior Notes, 2010 [Member]	Nov. 21, 2011 Senior Notes, 2011 [Member]	Sep. 30, 2013 London Interbank Offered Rate (LIBOR) [Member] Senior secured revolving credit facility [Member]	Jun. 30, 2011 London Interbank Offered Rate (LIBOR) [Member] Senior secured revolving credit facility [Member] Minimum [Member]	Jun. 30, 2011 London Interbank Offered Rate (LIBOR) [Member] Senior secured revolving credit facility [Member] Maximum [Member]	Sep. 30, 2013 Prime Rate [Member] Senior secured revolving credit facility [Member]	Jun. 30, 2011 Prime Rate [Member] Senior secured revolving credit facility [Member] Minimum [Member]	Jun. 30, 2011 Prime Rate [Member] Senior secured revolving credit facility [Member] Maximum [Member]
Long-term Debt, by Current and Noncurrent [Abstract]
Long-term Debt	$ 534,444,000		$ 519,597,000								$ 419,332,000	$ 418,617,000
Line of Credit Facility [Abstract]
Line of Credit Facility, Maximum Borrowing Capacity					250,000,000
Debt Instrument, Basis Spread on Variable Rate															2.75%	2.50%	3.25%	1.75%	1.50%	2.25%
Debt Instrument Stated Percentage of Outstanding Equity Interests of First Tier Foreign Subsidiaries That Secure Debt Obligations					65.00%
Line of Credit Facility, Amount Outstanding				115,000,000
Letters of Credit Outstanding, Amount				8,900,000
Line of Credit Facility, Remaining Borrowing Capacity				126,100,000
Ratio of Indebtedness to Net Capital				2.2
Ratio of Indebtedness to Net Capital, Senior				0.49
Ratio of Interest Coverage				5.5
Debt Instrument, Covenant Compliance, Ratio of Indebtedness to Net Capital							4.00
Debt Instrument, Covenant Compliance, Ratio of Indebtedness to Net Capital, Senior							2.50	2.00
Debt Instrument, Covenant Compliance, Ratio of Interest Coverage						2.50
Debt Instrument, Covenant Compliance, Ratio of Asset Coverage								1.00
Debt Instrument, Covenant Compliance, Line of Credit Facility, Remaining Borrowing Capacity After Capital Expenditures Adjustment To Avoid Future Capital Expenditures Restrictions								25,000,000
Debt Instrument, Covenant Compliance, Capital Expenditure Limitation Threshold, Ratio of Indebtedness to Net Capital, Senior							2.00
Capital Expenditure Limitation During Fiscal Year To Be Imposed If Covenant Noncompliance, Exceeding Stated Senior Consolidated Leverage Ratio				100,000,000
Capital Expenditure Limitation Maximum Amount Unused From Prior Fiscal Year Available to Increase Current Year Capital Expenditure Threshold If Restrictions Imposed Due to Noncompliance				30,000,000
Senior Notes [Abstract]
Debt Instrument, Face Amount									425,000,000				250,000,000	175,000,000
Debt Instrument, Interest Rate, Stated Percentage													9.875%
Debt Instrument, Unamortized Discount									7,000,000				10,600,000
Debt Instrument, Interest Rate, Effective Percentage													10.677%	9.66%
Proceeds from Issuance of Debt													234,800,000	172,700,000
Deferred Finance Costs, Gross													4,600,000	4,100,000
Debt Instrument, Actual Value to Face Value, Percentage													95.75%	101.00%
Debt Instrument, Unamortized Premium									1,300,000					1,800,000
Debt Instrument, Redeemable with Equity Issuance Proceeds, Required Repurchase Due to Change in Control Redemption Price, Percentage										101.00%
Debt Instrument, Redeemable with Equity Issuance Proceeds, Required Repurchase Due to Asset Disposition, Redemption Price, Percentage										100.00%
Deferred Finance Costs [Abstract]
Deferred Finance Costs, Net	8,000,000		9,600,000
Amortization of Financing Costs	$ 1,600,000	$ 1,600,000